Royal biographer Andrew Morton reveals when we will hear the happy news and even predicts the sex of the baby!.

Glowing with happiness, the Duchess of Cambridge was the centre of attention at the UK’s Epsom Derby race day last week, upstaging even the Queen. Not that any of the royal family appeared to mind being overshadowed by Kate, who was on her first official outing as William’s wife. Kate, 29, looked comfortable and at ease in the Royal Box, as she chatted with her royal in-laws, who made it clear this former commoner had been well and truly welcomed into “The Firm”.

A royal spokesman has confirmed the newlyweds will soon move into the late Princess Diana’s beloved Kensington Palace in London. While the place is full of happy memories for William, 28, the recently refurbished, modest-sized apartment will only be a “temporary” home for the couple. This has sparked a whirlwind of speculation that Kensington Palace is not large enough for a family and that children are part of the very near future for Wills and Kate.

Royal biographer Andrew Morton goes so far as to predict the duchess will fall pregnant within the next few months. “I would bet on the fact that William and Kate will be starting a family soon,” Andrew tells Woman’s Day. “I’ve looked at this statistically – and the future sovereign, after they’ve got married, their partner would be pregnant within three months..

“I expect her to have a girl because helicopter pilots traditionally have girls and I expect the baby’s name to have Diana in it.” “I suspect it won’t be long before we hear of a royal pregnancy,” agrees Katie Nicholl, author of The Making Of A Royal Romance. “They’ve made it no secret they want to start a family. Kate will be 30 next year and her one job now that she’s married to an heir to the throne is to produce an heir.”

Kate is keen to improve her fertility, but how is she going about it? Find out in this week's Woman's Day on sale June 13, 2011.