Kate, Britain's Duchess of Cambridge, made her first public appearance on Tuesday since it was announced she was pregnant, joining husband, Prince William, and his brother, Harry, at events to mark World Mental Health Day.

Last month William and Kate announced they were expecting her third child and that as with her two previous pregnancies, she was suffering severe morning sickness.

Last month, she was too ill to take her eldest child, George, to his first day at school because she was too unwell and her last public appearance had come at the end of August, when she joined William and Harry on a visit to a public garden at Kensington Palace dedicated to their late mother, Princess Diana.