The Duchess of Cambridge, Catherine Middleton and Prince William, Duke of Cambridge leave the King Edward VII hospital where she has been treated for hyperemesis gravidarum on December 6, 2012.
LONDON - The Duchess of Cambridge says she doesn't know the sex of her first child -- but she hopes it's a boy.
Her husband Prince William, however, would prefer a girl.
The former Kate Middleton, who is five months pregnant, made the revelation to a soldier Sunday at a St. Patrick's Day ceremony honoring the Irish Guards.
Guardsman Lee Wheeler said the duchess told him: "I'd like to have a boy and William would like a girl."
The duchess wore a green dress coat and a shamrock lapel pin as she presented sprigs of shamrock to soldiers in the annual ceremony at a barracks in Aldershot, southern England.
She suffered a minor mishap when one of her high heels became briefly stuck in a drainage grille.