Kate Middleton, 35, and Prince William, 35, made an announcement through Kensington Palace last Monday revealing the Duchess of Cambridge was pregnant again.
The Duchess was forced to share the news early after suffering severe morning sickness – Hyperemesis Gravidarum.
Many have speculated over the baby’s due date, and Prince William may have let slip his wife has reached the 12-week mark.
After receiving congratulations from an audience member at the National Mental health and Policing conference in Oxford, the future king said: “Thank you, it’s very good news. There’s not much sleep going on the moment,” according to OK! Magazine.
He then added: “It was a bit anxious to start with,” but that they can “start celebrating this week”.

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But now, the Duchess may have also given away the baby’s sex.
Kate Middleton’s food cravings during her pregnancy, according to a source, has given people a huge clue into the gender of the child.
A royal insider told the Daily Star: “Kate has always wanted a third child.
“She has been trying for another baby for months…she is suffering from nausea and morning sickness again, and she cannot stop eating spicy food and candy.”
According to an old wives’ tale craving for citrus fruits often leads to the mother giving birth to a girl.
But a craving for spicy food suggests that the newborn could be a boy.
No matter the sex of the baby, the Duchess is reportedly considering a home birth.
A source told MailOnline: “The Duchess knew it wasn’t possible for her first baby to be born at home, but she asked for a home birth for the second.
“Officials and doctors thought it too risky. There was concern and in the end she decided against it.”
It’s believed the Duchess wanted to give birth to Princess Charlotte at Kensington Palace but ended up taking advice from medics.
Kate gave birth to both George and Charlotte at the St Mary’s Hospital Lindo Wing – a private hospital in London.