The particular Duke and Duchess of Cambridge’s third child is due in Apr, Kensington Palace says.
It said the few were “delighted”. They already have 2 children: Prince George, who is 4, and his younger sister Charlotte, who might be two.
As with the girl previous pregnancies, the duchess has endured from hyperemesis gravidarum, or serious morning sickness.
The new baby will be fifth in-line to the throne, after its grandpa, father and older siblings.
The duchess is likely to give birth at the private Ideal wing of St Mary’s medical center in Paddington, where her some other children were born.
An official visit to Norway and Sweden, planned for November, has been postponed until early 2018 because of Catherine’s sickness.
Nevertheless , Prince William is going ahead having a solo trip to Finland in Nov.
The duchess became a member of Paddington Bear for a dance on the station platform during a surprise trip to a charity event on Mon.