24/09/2014 10:42 BST | Updated 20/05/2015 10:12 BST

Pregnant Duchess Of Cambridge Cancels Trip To Malta Because Of Extreme Morning Sickness

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge smile as they watch a bird display at Taronga Zoo in Sydney, Australia.

The Duchess of Cambridge, pregnant with her second baby, has cancelled her first official solo trip to Malta this weekend because she is suffering from extreme morning sickness.

Clarence House announced today (Thursday) that she was not well enough for the trip following discussions with Prince William and her doctors.

Kate has been suffering hyperemesis gravidarum, a severe form of morning sickness, for two weeks.

In the early stages of her pregnancy with Prince George she was hospitalised.

Kate was forced to cancel three engagements after it was announced on 8 September that she was pregnant with the couple's second child.

She was due to go to Malta this weekend for her first solo engagement to represent the Queen at the island's 50th anniversary celebrations of independence from Britain – carrying out 10 engagements in two days, including a boat trip across the Grand Harbour.

Prince William will now go in her place.

Hyperemesis gravidarum, which affects 3.5 per 1,000 pregnancies, causes severe vomiting and can lead to dehydration, weight loss and a build-up of toxins in the blood or urine, called ketosis.

Kate has been treated at home at Kensington Palace and at her parents' house in Bucklebury, Berkshire.

Kate Misses Malta Trip Due to Morning Sickness