Parents to be Kate Middleton & Prince William are at odds over the sex of their 1st born baby.

The Duchess of Cambridge said Sunday that she doesn't know the sex of the baby she's carrying, but hopes it's a boy. Her husband, would prefer a girl.

Middleton, who is 5 months pregnant, made the revelation to a soldier at a St. Patrick's Day ceremony honouring the Irish Guards.

Guardsman Lee Wheeler says the duchess told him the couple hadn't settled on names for the baby, who will be third in line to the British throne.

The duchess wore a green coat & a shamrock lapel pin as she presented sprigs of shamrock to soldiers in the annual ceremony at a barracks in Aldershot, southern England. She also pinned a spring on the collar of the regiment's mascot, an Irish wolfhound named Domhnall.

Kate suffered a minor mishap when one of her high heels became briefly stuck in a drainage grille. The duchess leaned on her husband as she wrenched it loose.

(With files from the Associated Press)