When Kate Middleton revealed she had bought a pram in light blue, Royal watchers wondered excitedly if she had dropped the biggest clue yet to the sex of her unborn child.

Kate Middleton – who is six months pregnant – told guests at a recent reception that she had chosen a buggy by designer label Bugaboo, which has celebrity fans including actress Sienna Miller and television presenter Peaches Geldof.

The buggies, which cost from £500 to £1,000 ($800-$1,600) and can operate as either a pushchair or pram, come in a variety of colors and parents who do not know the sex of their baby usually prefer neutral hues such as beige, off-white or black.

Kate Middleton and Prince William have insisted that they do not know if they are having a boy or a girl.

Kate Middleton, who is six months pregnant, told guests at a recent reception that she bought a Bugaboo pram in light blue

But although it is possible to swap some of the buggy’s accessories for those in different colors, including pink, Kate Middleton’s choice of blue will be seen as a clear hint as to her feelings about the gender.

The Duchess of Cambridge has said she would prefer a son while Prince William wants a daughter.

Yesterday, Bugaboo said it had not presented the buggy to the Royal couple after being advised by officials not to send gifts.

So it appears that the duchess, who was seen shopping for a Moses basket in South Kensington last week with her mother, bought the pram herself.

Kate Middleton, 31, revealed the Bugaboo color when she chatted to a group of Army wives at a drinks reception in Aldershot on St Patrick’s Day.

A source has claimed: “She and some of the other girls were talking about prams and one of the girls had her baby in a Bugaboo.

“Kate said she has bought one in light blue. It was a bit of a hint.”

Guardsman Lee Wheeler, 29, who met Kate Middleton at the ceremony, said the Duchess was happily discussing the Royal bump.

He said: “I asked her, <<Do you know if it’s a girl or a boy?>> and she said, <<Not yet>>.

“She said, <<I’d like to have a boy and William would like a girl>>. I asked her if she had any names and she said no.”

Since then, however, Kate Middleton and Prince William revealed they have a shortlist of boys’ and girls’ names.

Alexandra and Elizabeth are said to be favorites for a girl, with George in the running for a boy.