It looks like Kate may have let slip the sex of her baby, due to be born in July.

The Duchess of Cambridge is said to have let her guard down while accepting a teddy bear from a member of the public in Grimsby, almost revealing she was to have a daughter.

She was overheard telling the well-wisher: "Thank you, I will take that for my d..." before stopping herself.

Sandra Cook, 67, who was in the crowd next to Kate, told the Times: "I said to her, 'You were going to say daughter weren't you?' and she said, 'No, we don't know'. I said, 'Oh I think you do', to which she said, 'We're not telling'."

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Kate wrapped up in a high street coat

Kate, who is five months pregnant, joked with crowds in Grimsby after arriving more than an hour late.

Kate, whose helicopter from Kensington Palace was delayed due to thick fog, was given flowers and gifts for her baby as thousands turned out to see her.

Her baby bump was visible beneath her chocolate-coloured three-quarter length Hobbs coat, visited a fishing museum, a fire station and a school in the Lincolnshire town.

She also revealed her baby had been kicking, after one onlooker asked if she was feeling her unborn baby move around, to which she replied "Yes, very much so." She is 21 weeks pregnant.

grimbsy

Even the model of a fisherman seemed to take a shine to Kate

On her way into Peaks Lane fire station, she made an unplanned stop to meet around 10 adults and children who were patients at nearby St Andrew's Hospice.

Stooping slightly to talk to a group of women, who were wrapped in blankets as they sat in their wheelchairs, Kate shared a loud laugh with them.

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Kate smiled as she greeted crowds

Claire Moss-Smith, 86, said she had said to the Duchess: "I'm waiting for you to be Queen."

Kate laughed, she said, and replied: "You might be waiting a long time."

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  • Britain's Kate, The Duchess of Cambridge, receives flowers from children during her visit to Humberside Fire and Rescue Service, in Grimsby, Tuesday, March 5, 2013. The Duchess was visiting The Prince’s Trust Team program  which is a 12-week personal development scheme, which helps unemployed 16-25 year olds build the skills and confidence they need to get a job. (AP Photo/Scott Heppell)

  • Britain's Kate, the Duchess of Cambridge, waves during her visit to Humberside Fire and Rescue Service, in Grimsby, England, Tuesday, March 5, 2013. The Duchess was visiting The Prince’s Trust Team programme  a 12-week personal development scheme which helps unemployed 16-25 year olds build the skills and confidence they need to get a job. (AP Photo/Scott Heppell)

  • Britain's Kate, The Duchess of Cambridge, receives flowers from children during her visit to Humberside Fire and Rescue Service, in Grimsby, Tuesday, March 5, 2013. The Duchess was visiting The Prince’s Trust Team programme  which is a 12-week personal development scheme, which helps unemployed 16-25 year olds build the skills and confidence they need to get a job. (AP Photo/Scott Heppell)

  • Britain's Kate, The Duchess of Cambridge,gestures during her visit to Humberside Fire and Rescue Service, in Grimsby, northern England Tuesday, March 5, 2013. The Duchess was visiting The Prince’s Trust Team programme  which is a 12-week personal development scheme, which helps unemployed 16-25 year olds build the skills and confidence they need to get a job. (AP Photo/Scott Heppell)

  • Britain's Kate, The Duchess of Cambridge, is seen during her visit to Humberside Fire and Rescue Service, in Grimsby, Tuesday, March 5, 2013. The Duchess was visiting The Prince’s Trust Team programme  which is a 12-week personal development scheme, which helps unemployed 16-25 year olds build the skills and confidence they need to get a job. (AP Photo/Scott Heppell)

  • Britain's Kate, The Duchess of Cambridge, waves during her visit to Humberside Fire and Rescue Service, in Grimsby, Tuesday, March 5, 2013. The Duchess was visiting The Prince’s Trust Team programme  which is a 12-week personal development scheme, which helps unemployed 16-25 year olds build the skills and confidence they need to get a job. (AP Photo/Scott Heppell)

  • Britain's Kate, The Duchess of Cambridge, during her visit to Humberside Fire and Rescue Service, in Grimsby, Tuesday, March 5, 2013. The Duchess was visiting The Prince’s Trust Team programme  which is a 12-week personal development scheme, which helps unemployed 16-25 year olds build the skills and confidence they need to get a job. (AP Photo/Scott Heppell)

  • Royal visit to Grimsby

    The Duchess of Cambridge sits next to a dummy of the Ship's Mate at the Skipper's Table on display during her tour of the National Fishing Heritage Centre, Grimsby.

  • Britain's Kate, The Duchess of Cambridge, gestures during her visit to Humberside Fire and Rescue Service, in Grimsby, Tuesday, March 5, 2013. The Duchess was visiting The Prince’s Trust Team program  which is a 12-week personal development scheme, which helps unemployed 16-25 year olds build the skills and confidence they need to get a job. (AP Photo/Scott Heppell)

  • The Duchess Of Cambridge Makes An Official Visit To Grimsby

    GRIMSBY, UNITED KINGDOM - MARCH 5: Catherine, Duchess of Cambridge visits the Fishing Heritage Centre during an official visit to Grimsby on March 5, 2013 in Grimsby, England. (Photo by Samir Hussein/WireImage)

  • The Duchess Of Cambridge Makes An Official Visit To Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge during her official visit to The National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

  • The Duchess Of Cambridge Makes An Official Visit To Grimsby

    GRIMSBY, UNITED KINGDOM - MARCH 5: Catherine, Duchess of Cambridge meets a girl as she visits the Fishing Heritage Centre during an official visit to Grimsby on March 5, 2013 in Grimsby, England. (Photo by Samir Hussein/WireImage)

  • Royal visit to Grimsby

    The Duchess of Cambridge sits next to a dummy of the Ship's Mate at the Skipper's Table on display during her tour of the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge greets well-wishers outside the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge talks to former trawler-man John Vincent during her tour of the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge talks to former trawler-man John Vincent during her tour of the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge sits next to a dummy of the Ship's Mate at the Skipper's Table on display during her tour of the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge talks to former trawler-man John Vincent during her tour of the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge waves to the crowds outside the National Fishing Heritage Centre, Grimsby.

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: A man dressed in a St George costume rides past crowds waiting for the arrival of Catherine, Duchess of Cambridge on a motocycle decorated as a dragon at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: A man dressed in a St George costume rides past crowds waiting for the arrival of Catherine, Duchess of Cambridge on a motocycle decorated as a dragon at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • The Duchess Of Cambridge Visits Grimsby

    GRIMSBY, ENGLAND - MARCH 05: A man dressed in a St George costume rides past crowds waiting for the arrival of Catherine, Duchess of Cambridge on a motocycle decorated as a dragon at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

  • Royal visit to Grimsby

    The Duchess of Cambridge greets well-wishers outside the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge greets well-wishers outside the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge greets well-wishers outside the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge greets well-wishers outside the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge arrives outside the National Fishing Heritage Centre, Grimsby.

  • Royal visit to Grimsby

    The Duchess of Cambridge waves to the crowds outside the National Fishing Heritage Centre, Grimsby.