Prince George and Princess Charlotte have arrived at hospital to meet their new baby brother.
The new prince, who was born at St Mary’s Hospital, London, at 11:01 BST, weighing 8lb 7oz, is fifth in line to the throne.
Before entering through the doors of the Lindo Wing, Charlotte turned to wave to the crowds.
Kensington Palace said the Duchess of Cambridge and her son, who is yet to be named, are “both doing well”.
Members of both families had been informed and were “delighted with the news”.
Kensington Palace said the name of the baby would be announced in due course while a formal notice of the birth had been posted on the forecourt of Buckingham Palace.