Here are the names they are most likely to choose...
Royal Baby Number Two Boys Names
Alexandra(01 of08)
Alexandra is one of the Queen's middle names. It is also the name of her cousin Princess Alexandra. The Queen's great-grandmother was Queen Alexandra.
Queen Alexandra, who was born in 1844, was married to King Edward VII. A Danish princess, she had a happy childhood and was known to her family as Alix. She was once considered one of the most beautiful princesses in Europe. Like William's mother, she held the title the Princess of Wales before Queen Victoria's son Edward VII acceded to the throne. (credit:Omikron via Getty Images)
Queen Alexandra, who was born in 1844, was married to King Edward VII. A Danish princess, she had a happy childhood and was known to her family as Alix. She was once considered one of the most beautiful princesses in Europe. Like William's mother, she held the title the Princess of Wales before Queen Victoria's son Edward VII acceded to the throne. (credit:Omikron via Getty Images)
Alice(02 of08)
Alice has been a favourite at the bookmakers. Princess Alice was the third child and second daughter of Queen Victoria and the great-grandmother of the Duke of Edinburgh. Her daughter Alix married Tsar Nicholas II of Russia and was later executed alongside her family by the Bolsheviks in 1918.
Living in Germany after marrying Prince Louis of Hesse, Princess Alice later became the Grand Duchess of Hesse and by Rhine. She was said to have had a warm heart and opened hospitals, championed women's causes, founded women's guilds and patronised women's unions. She died when she was just 35 in 1878.
Her granddaughter, also called Alice, was the Duke of Edinburgh's mother - Princess Alice of Battenberg. Later Princess Andrew of Greece, she saw little of Philip when he was a child. She fell ill and was committed to a sanatorium. In later years, she went to live at Buckingham Palace and was said to walk around in a nun's habit, smoking Woodbines. She founded an order of nuns and wore a habit to the Queen's coronation in 1953.
Another Princess Alice was the Duchess of Gloucester - who died at the age of 102 in 2004 and was the mother of the present Duke of Gloucester. Alice was the longest-living British royal in history so far. (credit:duncan1890 via Getty Images)
Living in Germany after marrying Prince Louis of Hesse, Princess Alice later became the Grand Duchess of Hesse and by Rhine. She was said to have had a warm heart and opened hospitals, championed women's causes, founded women's guilds and patronised women's unions. She died when she was just 35 in 1878.
Her granddaughter, also called Alice, was the Duke of Edinburgh's mother - Princess Alice of Battenberg. Later Princess Andrew of Greece, she saw little of Philip when he was a child. She fell ill and was committed to a sanatorium. In later years, she went to live at Buckingham Palace and was said to walk around in a nun's habit, smoking Woodbines. She founded an order of nuns and wore a habit to the Queen's coronation in 1953.
Another Princess Alice was the Duchess of Gloucester - who died at the age of 102 in 2004 and was the mother of the present Duke of Gloucester. Alice was the longest-living British royal in history so far. (credit:duncan1890 via Getty Images)
Charlotte(03 of08)
William and Kate could name a daughter Charlotte - the feminine form of Charles - in honour of the Duke's father and the baby's grandfather, the Prince of Wales.
Queen Charlotte, who was born in 1744, was married to George III. Charlotte was actually her second name - her first was Sophie. A keen botanist, she founded Kew Gardens, had 15 children - 13 of whom survived - and was a patron of the arts. Some historians have argued that she was of African descent. Her daughter, born in 1766, was also called Charlotte and later known as the Princess Royal.George IV also named his only child Charlotte, but she died in childbirth at the age of 21, leading to a mass outpouring of grief across the nation.
Charlotte is also the middle name of Pippa Middleton (pictured). (credit:Dominic Lipinski/PA Wire)
Queen Charlotte, who was born in 1744, was married to George III. Charlotte was actually her second name - her first was Sophie. A keen botanist, she founded Kew Gardens, had 15 children - 13 of whom survived - and was a patron of the arts. Some historians have argued that she was of African descent. Her daughter, born in 1766, was also called Charlotte and later known as the Princess Royal.George IV also named his only child Charlotte, but she died in childbirth at the age of 21, leading to a mass outpouring of grief across the nation.
Charlotte is also the middle name of Pippa Middleton (pictured). (credit:Dominic Lipinski/PA Wire)
Diana(04 of08)
William and Kate are also likely to want to remember his late mother Diana, Princess of Wales, who died in a car crash when William was just 15.
The Duke places great importance on honouring her memory, having already used Diana's sapphire and diamond engagement ring when he proposed to Kate.
It is thought likely they would use the name Diana, if not as a first name, then as one of a baby daughter's middle names. (credit:Ron Bell/PA Archive)
The Duke places great importance on honouring her memory, having already used Diana's sapphire and diamond engagement ring when he proposed to Kate.
It is thought likely they would use the name Diana, if not as a first name, then as one of a baby daughter's middle names. (credit:Ron Bell/PA Archive)
Elizabeth(05 of08)
There is speculation William and Kate will pick Elizabeth - if not as a first name then as a middle name - for a girl in honour of William's grandmother and the reigning Queen.
The Queen is held in great respect by her family and William has spoken of how she has become an even more important part of his life as he has grown older. Kate too has forged a strong bond with William's grandmother in her short time as a royal. The Queen was known as Lilibet as a child.
William's great-grandmother the Queen Mother was also an Elizabeth. It is Kate's middle name and her mother's middle name too. (credit:CATHAL MCNAUGHTON/WPA Rota)
The Queen is held in great respect by her family and William has spoken of how she has become an even more important part of his life as he has grown older. Kate too has forged a strong bond with William's grandmother in her short time as a royal. The Queen was known as Lilibet as a child.
William's great-grandmother the Queen Mother was also an Elizabeth. It is Kate's middle name and her mother's middle name too. (credit:CATHAL MCNAUGHTON/WPA Rota)
Frances(06 of08)
Frances was Diana, Princess of Wales's middle name and was also the name of William's grandmother - Diana's mother Frances Shand Kydd (pictured with Prince Philip in 1981).
It is also a recurring name in Kate's family tree. It was her great-great-great grandmother's first name and appears a number of times in the male form Francis. (credit:ASSOCIATED PRESS)
It is also a recurring name in Kate's family tree. It was her great-great-great grandmother's first name and appears a number of times in the male form Francis. (credit:ASSOCIATED PRESS)
Mary(07 of08)
Mary is one of the Queen's middle names. It was also her grandmother's name. Mary of Teck (pictured) married George V.
Britain has seen two Marys on the throne - Mary I, known as Bloody Mary for her persecution of Protestants, and Mary II who ruled jointly as monarch with her Dutch husband William III.
The last example of a great-granddaughter of a still-serving Sovereign born on the male line was Princess Mary, who was born in 1897 and was George VI's sister. (credit:Photo 12 via Getty Images)
Britain has seen two Marys on the throne - Mary I, known as Bloody Mary for her persecution of Protestants, and Mary II who ruled jointly as monarch with her Dutch husband William III.
The last example of a great-granddaughter of a still-serving Sovereign born on the male line was Princess Mary, who was born in 1897 and was George VI's sister. (credit:Photo 12 via Getty Images)
Victoria(08 of08)
Queen Victoria is the longest-reigning monarch in British history - although she is due to be overtaken by Elizabeth II this September.She was actually named Alexandrina Victoria and as a child was nicknamed Drina, but ruled as Victoria, which she is said to have preferred.
Victoria was queen for more than 63 years, acceding to the throne in 1837. Britain had evolved into a constitutional monarchy. She became the figurehead of a vast empire and her reign spanned the rest of the century.
She married Prince Albert and had nine children, but mourned Albert's early death for the rest of her life. The name has been a popular choice for princesses in the British royal family in tribute to Victoria.
On numerous occasions, royal daughters have been christened Victoria but often been known by one of their middle names instead. (credit:chrisdorney via Getty Images)
Victoria was queen for more than 63 years, acceding to the throne in 1837. Britain had evolved into a constitutional monarchy. She became the figurehead of a vast empire and her reign spanned the rest of the century.
She married Prince Albert and had nine children, but mourned Albert's early death for the rest of her life. The name has been a popular choice for princesses in the British royal family in tribute to Victoria.
On numerous occasions, royal daughters have been christened Victoria but often been known by one of their middle names instead. (credit:chrisdorney via Getty Images)
Kate might choose to remember her grandmothers Valerie and Dorothy. Harriet is also a family name on her father's side. She could decide to use her mother's name, Carole - or a form of it, such as Caroline or Carolina.
If it had been a boy, they would most likely have chosen from one of these names...
Royal Baby Number Two Boys Names
Albert(01 of07)
Queen Victoria used to insist that the name Albert was used as a middle name by her descendants, if not a first, in honour of her much-loved consort Prince Albert.
Albert took an active interest in the arts, science, trade and industry. He masterminded the Great Exhibition of 1851. He died when he was 42, leaving Victoria mourning for him for the rest of her life.Victoria and Albert's eldest son Edward VII was actually Albert Edward and known as Bertie to his family. Their other sons all had Albert as a middle name - a tradition that carried on through the generations. Prince Harry has Albert as one of his middle names.
By choosing Albert or Bertie for a boy, William and Kate would also be honouring the Queen's father, George VI who was actually Albert Frederick Arthur George and always known to his family as Bertie.Shy, stammering Bertie was forced to become king when his brother Edward VIII abdicated, but won the nation's affection by standing firm in London during the Second World War. (credit:Anthony Baggett via Getty Images)
Albert took an active interest in the arts, science, trade and industry. He masterminded the Great Exhibition of 1851. He died when he was 42, leaving Victoria mourning for him for the rest of her life.Victoria and Albert's eldest son Edward VII was actually Albert Edward and known as Bertie to his family. Their other sons all had Albert as a middle name - a tradition that carried on through the generations. Prince Harry has Albert as one of his middle names.
By choosing Albert or Bertie for a boy, William and Kate would also be honouring the Queen's father, George VI who was actually Albert Frederick Arthur George and always known to his family as Bertie.Shy, stammering Bertie was forced to become king when his brother Edward VIII abdicated, but won the nation's affection by standing firm in London during the Second World War. (credit:Anthony Baggett via Getty Images)
Arthur(02 of07)
One of Charles's middle names, Arthur is also one of William's middle names and was a middle name of the Queen's father George VI.
Arthur would evoke thoughts of the legendary King Arthur, leader of the knights of the Round Table, who supposedly lived in the 5th or 6th century.
Once popular, the name fell out of fashion but has had a revival in recent years. Prime Minister David Cameron has a son called Arthur. Nicknames include Art or Artie. Well known Arthurs include Minder character Arthur Daley and the Sherlock Holmes author Sir Arthur Conan Doyle.
Henry VIII's older brother was Arthur, Prince of Wales. Queen Victoria also had a son called Arthur, who became the Duke of Connaught and Strathearn. (credit:Matt Dunham/AP)
Arthur would evoke thoughts of the legendary King Arthur, leader of the knights of the Round Table, who supposedly lived in the 5th or 6th century.
Once popular, the name fell out of fashion but has had a revival in recent years. Prime Minister David Cameron has a son called Arthur. Nicknames include Art or Artie. Well known Arthurs include Minder character Arthur Daley and the Sherlock Holmes author Sir Arthur Conan Doyle.
Henry VIII's older brother was Arthur, Prince of Wales. Queen Victoria also had a son called Arthur, who became the Duke of Connaught and Strathearn. (credit:Matt Dunham/AP)
Charles(03 of07)
William is close to his father and is likely to want to show his affection if he has a son. Charles is also the name of Diana, Princess of Wales's brother, Earl Spencer (pictured).
Charles, however, is considered an unlucky royal name as Charles I was executed and Charles II's reign saw the plague and the Great Fire of London. (credit:Chris Radburn/PA Wire)
Charles, however, is considered an unlucky royal name as Charles I was executed and Charles II's reign saw the plague and the Great Fire of London. (credit:Chris Radburn/PA Wire)
Francis(04 of07)
Francis is the middle name of both Kate's father and her grandfather. Her great-great-great grandfather's first name was Francis and he married a Frances, Kate's great-great-great grandmother. (credit:Ma-Ke via Getty Images)
Frederick(05 of07)
A Prince Freddie of Cambridge would have a historical link to the 1st Duke of Cambridge.Prince Adolphus Frederick lived from 1774 to 1850 and was given the title the Duke of Cambridge by his father George III in 1801 when he was 27, but was never a Prince of Cambridge. His son was a Prince George of Cambridge.
Adolphus Frederick was William's great-great-great-great grandfather, through the family line of William's great-great-grandmother Queen Mary. He was also Chancellor of St Andrews University in Scotland, where William and Kate met.
The Duke was described by his father as being ''lively''. He was a military man, a popular figure and a great supporter of charities, literature and the sciences.
He was apparently very fond of interrupting church services by bellowing out ''By all means'' if the priest said ''Let us pray''.
William's second cousin once removed is a Frederick - Lord Freddie Windsor (pictured) - who was once best known for the scandal that ensued in 1999 when he was reportedly spotted snorting cocaine. The outcry was sparked not least because Lord Freddie was seen as a friend of Prince William who was then just 17. He is the son of Prince and Princess Michael of Kent.
Frederick was also a middle name of the Queen's father George VI. (credit:Ian West/PA Wire)
Adolphus Frederick was William's great-great-great-great grandfather, through the family line of William's great-great-grandmother Queen Mary. He was also Chancellor of St Andrews University in Scotland, where William and Kate met.
The Duke was described by his father as being ''lively''. He was a military man, a popular figure and a great supporter of charities, literature and the sciences.
He was apparently very fond of interrupting church services by bellowing out ''By all means'' if the priest said ''Let us pray''.
William's second cousin once removed is a Frederick - Lord Freddie Windsor (pictured) - who was once best known for the scandal that ensued in 1999 when he was reportedly spotted snorting cocaine. The outcry was sparked not least because Lord Freddie was seen as a friend of Prince William who was then just 17. He is the son of Prince and Princess Michael of Kent.
Frederick was also a middle name of the Queen's father George VI. (credit:Ian West/PA Wire)
Philip(06 of07)
William and Kate could acknowledge William's grandfather Prince Philip with the names they pick. Both Charles and William have Philip as a middle name. They could opt to use the nickname Pip. Kate's sister is Philippa - Pippa - Middleton. (credit:Sang Tan/AP)
James(07 of07)
James is popular at the bookmakers. William, however, already has a cousin James - the Earl and Countess of Wessex's son Viscount Severn (pictured).
But the name could be used as a middle name to signify Kate's affection for her brother, the baby's uncle James Middleton.James is a Stuart name. James I, son of Mary, Queen of Scots, had been king of Scotland for 36 years as James VI when he became king of England in 1603. (credit:Steve Parsons/PA Archive)
But the name could be used as a middle name to signify Kate's affection for her brother, the baby's uncle James Middleton.James is a Stuart name. James I, son of Mary, Queen of Scots, had been king of Scotland for 36 years as James VI when he became king of England in 1603. (credit:Steve Parsons/PA Archive)
They could have also chosen William as a nod to his father the Duke of Cambridge, but also perhaps Michael as a middle name out of respect for Kate's father.
Kate's grandfather on her paternal side was called Peter, while on her maternal side, her grandfather was Ronald. Thomas also appears several times on both sides of Kate's family.
Sam or Samuel had been suggested as a possibility too - Kate's friend the jockey Sam Waley-Cohen was said to have helped William and Kate reconcile after their split in 2007.
Duchess Of Cambridge Labour - Live Images
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by Danny Martindale/WireImage) (credit:Danny Martindale via Getty Images)
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Britain's Prince William, Duke of Cambridge, carries his newly-born daughter, his second child with Catherine, Duchess of Cambridge, as they leave the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/Getty Images) (credit:JOHN STILLWELL via Getty Images)
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ALTERNATIVE CROP. Princess of Cambridge is carried by The Duke of Cambridge in a baby car seat outside the Lindo Wing of St Mary's Hospital in London. (credit:John Stillwell/PA Wire)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34 am this morning, weighing 8lbs 3 oz, who will be fourth in line to the throne. (Photo by Ben Pruchnie/FilmMagic) (credit:Ben Pruchnie via Getty Images)
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Britain's Catherine, Duchess of Cambridge holds her newly-born daughter, her second child with Britain's Prince William, Duke of Cambridge, as they show her to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/Getty Images) (credit:JOHN STILLWELL via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by John Stillwell - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/Getty Images) (credit:JOHN STILLWELL via Getty Images)
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Britain's Prince William, Duke of Cambridge, carries his newly-born daughter, his second child with Catherine, Duchess of Cambridge, as they leave the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Britain's Prince William, Duke of Cambridge, carries his newly-born daughter, his second child with Catherine, Duchess of Cambridge, as they leave the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/Getty Images) (credit:JOHN STILLWELL via Getty Images)
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Britain's Catherine, Duchess of Cambridge holds her newly-born daughter, her second child with Britain's Prince William, Duke of Cambridge, as they show her to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge and Catherine, Duchess Of Cambridge depart the Lindo Wing with their new baby daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning weighing 8lbs 3oz. (Photo by Mike Marsland/WireImage) (credit:Mike Marsland via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Britain's Prince William, Duke of Cambridge, walks with his wife Catherine, Duchess of Cambridge as she carries their newly-born daughter, their second child, out of the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge and Catherine, Duchess Of Cambridge depart the Lindo Wing with their new baby daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning weighing 8lbs 3oz. (Photo by Mike Marsland/WireImage) (credit:Mike Marsland via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary's Hospital with their newborn daughter on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary's Hospital with their newborn daughter on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge and Catherine, Duchess Of Cambridge depart the Lindo Wing with their new baby daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning weighing 8lbs 3oz. (Photo by Mike Marsland/WireImage) (credit:Mike Marsland via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary's Hospital with their newborn daughter on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary's Hospital with their newborn daughter on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary's Hospital with their newborn daughter on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge as they show their newly-born daughter, their second child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge and his son Prince George return to the Lindo Wing at St Mary's Hospital on May 2, 2015 in London, England. The Duchess of Cambridge was safely delivered of a daughter at 8:34am this morning weighing 8lbs 3oz. (Photo by Mike Marsland/WireImage) (credit:Mike Marsland via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge and his son Prince George return to the Lindo Wing at St Mary's Hospital on May 2, 2015 in London, England. The Duchess of Cambridge was safely delivered of a daughter at 8:34am this morning weighing 8lbs 3oz. (Photo by Mike Marsland/WireImage) (credit:Mike Marsland via Getty Images)
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Prince William, Duke of Cambridge and Prince George of Cambridge outside St Mary's Hospital, Paddington, in the City of Westminster, London where the Duchess of Cambridge gave birth to a baby girl at 8.34am on 02/05/2015 weighing 8lbs 3oz.Mandatory Credit: Matt Crossick/ Empics Entertainment (credit:Matt Crossick/Matt Crossick)
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Prince William, Duke of Cambridge and Prince George of Cambridge outside St Mary's Hospital, Paddington, in the City of Westminster, London where the Duchess of Cambridge gave birth to a baby girl at 8.34am on 02/05/2015 weighing 8lbs 3oz.Mandatory Credit: Matt Crossick/ Empics Entertainment (credit:Matt Crossick/Matt Crossick)
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Prince William, Duke of Cambridge and Prince George of Cambridge outside St Mary's Hospital, Paddington, in the City of Westminster, London where the Duchess of Cambridge gave birth to a baby girl at 8.34am on 02/05/2015 weighing 8lbs 3oz.Mandatory Credit: Matt Crossick/ Empics Entertainment (credit:Matt Crossick/Matt Crossick)
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Prince William, Duke of Cambridge and Prince George of Cambridge outside St Mary's Hospital, Paddington, in the City of Westminster, London where the Duchess of Cambridge gave birth to a baby girl at 8.34am on 02/05/2015 weighing 8lbs 3oz.Mandatory Credit: Matt Crossick/ Empics Entertainment (credit:Matt Crossick/Matt Crossick)
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Prince William, Duke of Cambridge and Prince George of Cambridge outside St Mary's Hospital, Paddington, in the City of Westminster, London where the Duchess of Cambridge gave birth to a baby girl at 8.34am on 02/05/2015 weighing 8lbs 3oz.Mandatory Credit: Matt Crossick/ Empics Entertainment (credit:Matt Crossick/Matt Crossick)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge leaves St Mary's Hospital after the birth of his new daughter on May 2, 2015 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images) (credit:Mark Cuthbert via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge leaves St Mary's Hospital after the birth of his new daughter on May 2, 2015 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images) (credit:Mark Cuthbert via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge leaves the Lindo Wing after the birth of his newborn daugther at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge leaves the Lindo Wing after the birth of his newborn daugther at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images) (credit:Ian Gavan via Getty Images)
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LONDON, ENGLAND - MAY 02: Prince William, Duke of Cambridge departs the Lindo Wing following the birth his second child at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Samir Hussein/WireImage) (credit:Samir Hussein via Getty Images)
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Britain's Prince William, Duke of Cambridge (R), carrying his son Prince George of Cambridge returns to the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015 where his wife Catherine, Duchess of Cambridge, gave birth to their second child, a baby girl, earlier in the day. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly-born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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Britain's Prince William waves as he leaves St. Mary's Hospital's exclusive Lindo Wing, London, Saturday, May 2, 2015. William's wife, Kate, the Duchess of Cambridge, gave birth to a baby girl on Saturday morning. (AP Photo/Matt Dunham) (credit:ASSOCIATED PRESS)
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Britain's Prince William drives away from St. Mary's Hospital's exclusive Lindo Wing, London, Saturday, May 2, 2015. William's wife, Kate, the Duchess of Cambridge, gave birth to a baby girl on Saturday morning. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
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Britain's Prince William leaves St. Mary's Hospital's exclusive Lindo Wing, London, Saturday, May 2, 2015. William's wife, Kate, the Duchess of Cambridge, gave birth to a baby girl on Saturday morning. (AP Photo/Matt Dunham) (credit:ASSOCIATED PRESS)
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Britain's Prince William waves and smiles as he leaves St. Mary's Hospital's exclusive Lindo Wing, London, Saturday, May 2, 2015. William's wife, Kate, the Duchess of Cambridge, gave birth to a baby girl on Saturday morning. (AP Photo/Matt Dunham) (credit:ASSOCIATED PRESS)
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Britain's Prince William, right, waves as he leaves the Lindo Wing, where his wife Kate, the Duchess of Cambridge, gave birth to their daughter at St. Mary's Hospital, London, Saturday, May 2, 2015. The Duchess gave birth to the Princess on Saturday morning. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
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Britain's Prince William, right, leaves the Lindo Wing, where his wife Kate, the Duchess of Cambridge, gave birth to their daughter at St. Mary's Hospital, London, Saturday, May 2, 2015. The Duchess gave birth to the Princess on Saturday morning. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
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Britain's Prince William waves to members of the public and the media as he leaves the Lindo Wing, where his wife Kate, the Duchess of Cambridge, gave birth to their daughter, at St. Mary's Hospital, London, Saturday, May 2, 2015. The Duchess gave birth to the Princess on Saturday morning. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
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The press and public watch town crier Tony Appleton announces the birth of the Duke and Duchess of Cambridge's second baby, a girl, at the Lindo Wing of St Mary's Hospital in London. (credit:Matt Crossick/Matt Crossick)
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The press and public watch town crier Tony Appleton announces the birth of the Duke and Duchess of Cambridge's second baby, a girl, at the Lindo Wing of St Mary's Hospital in London. (credit:Matt Crossick/Matt Crossick)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph of the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: People photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph of the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Tourists pose for photographs as Metropolitan Police officers keep an eye on the thousands of people lined up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Two-year-old Fleur Burrows waves the Union Jack flag, joining thousands of people in front of Buckingham Palace after the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. Catherine, Duchess of Cambridge delivered the baby girl at 8:34am Saturday and she is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of well-wishers gather in front of Buckingham Palace before the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, ENGLAND - MAY 2: Well wishers gather to look at an easel that was placed in the forecourt of Buckingham Palace following the announcement that Catherine, Duchess of Cambridge has given birth to a baby girl at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by Steve Parsons - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: A Metropolitan Police officer attempts to clear people away from the front of Buckingham Palace before the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: A Metropolitan Police officer attempts to clear people away from the front of Buckingham Palace as thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, UNITED KINGDOM - MAY 02: Thousands of people line up for a chance to glimpse and photograph the announcement of the birth of Prince William, Duke of Cambridge and the Duchess of Cambridge's second child outside Buckingham Palace on May 2, 2015 in London, United Kingdom. The baby girl arrived at 8:34am Saturday and is the fourth in line to the throne and the Queen's fifth great-grandchild. (Photo by Chip Somodevilla/Getty Images) (credit:Chip Somodevilla via Getty Images)
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LONDON, ENGLAND - MAY 2: A member of the crowd looks through the fence to view the easel that is placed in the forecourt of Buckingham Palace following the announcement that Catherine, Duchess of Cambridge has given birth to a baby girl at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by Steve Parsons - WPA Pool/Getty Images) (credit:WPA Pool via Getty Images)
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Members of the media gather outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015, after the news emerged that Catherine, Duchess of Cambridge, Prince William's wife, second child, a daughter, was born. The Duchess of Cambridge was safely delivered of a daughter, the Princess of Cambridge, weighing 8lbs 3oz, Kensington Palace announced Saturday. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Members of the media gather outside the Lindo Wing at St Mary's Hospital in central London, on May 2, 2015, after the news emerged that Catherine, Duchess of Cambridge, Prince William's wife, second child, a daughter, was born. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced Saturday. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Two Toulon rugby team fans walk past the gathered media as Police guard the front entrance of the Lindo Wing of St. Mary's Hospital, after Kate, Duchess of Cambridge arrived to give birth to her second child in London, Saturday, May, 2, 2015. Toulon play Clermont Auvergne in London for the European Rugby Union Champions Cup, Saturday, in an all French final.(AP Photo/Alastair Grant) (credit:ASSOCIATED PRESS)
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Crowds gather as Tony Appleton, a town crier, announces to the assembled media the birth of the royal baby, outside the Lindo Wing, St. Mary's Hospital, London, Saturday, May 2, 2015. Kate, the Duchess of Cambridge, has given birth to a baby girl, royal officials said Saturday. (AP Photo/Tim Ireland) (credit:ASSOCIATED PRESS)
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An easel is placed in the forecourt of Buckingham Palace in London to announce the birth of the royal baby, Saturday, May 2, 2015. Kate, the Duchess of Cambridge, has given birth to a baby girl, royal officials said Saturday. (Steve Parsons/Pool via AP) (credit:ASSOCIATED PRESS)
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An easel is placed in the forecourt of Buckingham Palace in London to announce the birth of the royal baby, Saturday, May 2, 2015. Kate, the Duchess of Cambridge, has given birth to a baby girl, royal officials said Saturday. (Steve Parsons/Pool via AP) (credit:ASSOCIATED PRESS)
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LONDON, ENGLAND - MAY 02: Wellwishers and media gather following the announcement that Catherine, Duchess Of Cambridge has given birth to a baby girl, outside the Lindo Wing at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Wellwishers and media gather following the announcement that Catherine, Duchess Of Cambridge has given birth to a baby girl, outside the Lindo Wing at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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An easel is placed in the forecourt of Buckingham Palace in London to announce the birth of the royal baby, Saturday, May 2, 2015. Kate, the Duchess of Cambridge, has given birth to a baby girl, royal officials said Saturday. (Steve Parsons/Pool via AP) (credit:ASSOCIATED PRESS)
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Town crier Tony Appleton holds a scroll as he makes an announment of the birth of Catherine, Duchess of Cambridge and Prince William's second child, a daughter, outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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LONDON, ENGLAND - MAY 02: A Town Crier makes the announcement that Catherine, Duchess Of Cambridge has given birth to a baby girl, outside the Lindo Wing at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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A royal fans holds up a sign the reads 'Its a princess' as they celebrate following the announcement of the birth of Catherine, Duchess of Cambridge and Prince William's second child, a daughter, outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Town crier Tony Appleton makes an announment of the birth of Catherine, Duchess of Cambridge and Prince William's second child, a daughter, outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Town crier Tony Appleton makes an announment of the birth of Catherine, Duchess of Cambridge and Prince William's second child, a daughter, outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. The newly born Princess of Cambridge is fourth in line to the British throne. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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LONDON, ENGLAND - MAY 02: Tony Appleton, the English town crier, announces the Duke and Duchess of Cambridge have given birth to a baby girl at St Mary's Hospital on May 2, 2015 in London, England. (Photo by Samir Hussein/WireImage) (credit:Samir Hussein via Getty Images)
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Tony Appleton, a town crier, announces to the assembled media the birth of the royal baby, outside the Lindo Wing, St. Mary's Hospital, London, Saturday, May 2, 2015. Kate, the Duchess of Cambridge, has given birth to a baby girl, royal officials said Saturday. (AP Photo/Alastair Grant) (credit:ASSOCIATED PRESS)
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Royal fans celebrate outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the news is passed that Catherine, Duchess of Cambridge and Prince William's second child, a daughter, was born. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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Royal fans celebrate outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the news is passed that Catherine, Duchess of Cambridge, Prince William's wife, second child, a daughter, was born. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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Betting odds are written on a chalkboard outside the Lindo Wing at St. Mary's Hospital in anticipation of Kate, Duchess Cambridge giving birth to her second child, London, Saturday, May 2, 2015. Prince William's wife Kate entered a London hospital Saturday to give birth to their second child, igniting a national wave of anticipation and a last-minute betting spree on the name of the new prince or princess. (AP Photo/Tim Ireland) (credit:ASSOCIATED PRESS)
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Royal fans celebrate outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the news is passed that Catherine, Duchess of Cambridge, Prince William's wife, second child, a daughter, was born. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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A royal fan stands outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after Catherine, Duchess of Cambridge, Prince William's wife, was admitted to hospital on May 2 in the early stages of labour with her second child. The Duchess of Cambridge was safely delivered of a daughter, Kensington Palace announced. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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Royal fans celebrate outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the news is passed that Catherine, Duchess of Cambridge, Prince William's wife, second child, a daughter, was born. The Duchess of Cambridge was safely delivered of a daughter weighing 8lbs 3oz, Kensington Palace announced. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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LONDON, ENGLAND - MAY 02: Nick Witchell of the BBC comments on live camera at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Media gather at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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A man wearing a jacket with a British flag speak with media teams outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that the Duchess of Cambridge, Prince William's wife Kate was admitted to hospital on May 2 in the early stages of labour with her second child. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
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LONDON, ENGLAND - MAY 02: Media gather at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Max Foster of CNN broadcasts live from the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Media gather at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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Royal fan Terry Hutt waits outside the Lindo Wing at St. Mary's Hospital in anticipation of Kate, Duchess Cambridge giving birth to her second child, London, Saturday, May 2, 2015. Prince William's wife Kate entered a London hospital Saturday to give birth to their second child, igniting a national wave of anticipation and a last-minute betting spree on the name of the new prince or princess. (AP Photo/Tim Ireland) (credit:ASSOCIATED PRESS)
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LONDON, ENGLAND - MAY 02: Rhiannon Mills of Sky News broadcasts live from the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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Police guard the front entrance to the Lindo Wing of St Mary's Hospital as Kate, Duchess of Cambridge, has arrived and gone into labor to give birth to her second child, in London, Saturday, May 2, 2015. (AP Photo/Alastair Grant) (credit:ASSOCIATED PRESS)
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Police guard the front entrance to the Lindo Wing of St Mary's Hospital as Kate, Duchess of Cambridge, has arrived and gone into labor to give birth to her second child, in London, Saturday, May, 2, 2015. (AP Photo/Alastair Grant) (credit:ASSOCIATED PRESS)
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Police guard the front entrance to the Lindo Wing of St Mary's Hospital, and the media pens opposite as Kate, Duchess of Cambridge, has arrived and gone into labor to give birth to her second child in London, Saturday, May 2, 2015. (AP Photo/Alastair Grant) (credit:ASSOCIATED PRESS)
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LONDON, ENGLAND - MAY 02: Policemen wait outside the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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A chalkboard displays the latest betting odds on the name of Catherine, Duchess of Cambridge and Prince William's second child outside the entrance to the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that Catherine was admitted to hospital on May 2 in the early stages of labour. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Fans of French rugby union team Toulon sing songs outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that Catherine, Duchess of Cambridge, Prince William's wife, was admitted to hospital on May 2 in the early stages of labour with her second child. Toulon will play the European Champions Cup final at Twickenham against Clermont later on May 2. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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LONDON, ENGLAND - MAY 02: Simon Viger of 5 uses Periscope at the Lindo Wing after it was announced that Catherine, Duchess of Cambridge has gone into Labour and is at St Mary's Hospital on May 2, 2015 in London, England. The Duchess is expecting her second child soon. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Media gather at the Lindo Wing after it was announced that Catherine, Duchess of Cambridge has gone into Labour and is at St Mary's Hospital on May 2, 2015 in London, England. The Duchess is expecting her second child soon. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Simon Viger of 5 and Dickie Arbiter use Periscope at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Fans dress in the Union Jack flag at the Lindo Wing after it was announced that Catherine, Duchess of Cambridge has gone into Labour and is at St Mary's Hospital on May 2, 2015 in London, England. The Duchess is expecting her second child soon. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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LONDON, ENGLAND - MAY 02: Children scooter by as police patrol at the Lindo Wing after it was announced that Catherine, Duchess of Cambridge has gone into Labour and is at St Mary's Hospital on May 2, 2015 in London, England. The Duchess is expecting her second child soon. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)
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Members of the media take their positions outside the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that Catherine, Duchess of Cambridge, Prince William's wife, was admitted to hospital on May 2 in the early stages of labour with her second child. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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A broadcast journalist stands in front of the media pen outside the entrance to the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that Catherine, Duchess of Cambridge, Prince William's wife, was admitted to hospital on May 2 in the early stages of labour with her second child. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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A cyclist passes by as police officers stand outside the entrance to the Lindo wing at St Mary's hospital in central London, on May 2, 2015 after the announcement was made by Kensington Palace that Catherine, Duchess of Cambridge, Prince William's wife, was admitted to hospital on May 2 in the early stages of labour with her second child. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images) (credit:BEN STANSALL via Getty Images)
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LONDON, ENGLAND - MAY 02: Media gather at the Lindo Wing after it was announced that the Duchess of Cambridge has gone into Labour at St Mary's Hospital on May 2, 2015 in London, England. Catherine, Duchess of Cambridge is expected to give birth at the Lindo wing sometime in the next couple of weeks. (Photo by Chris Jackson/Getty Images) (credit:Chris Jackson via Getty Images)