The new royal baby is fifth in line to the throne, bumping Prince Harry to sixth. His official title is HRH Prince of Cambridge.
Kensington Palace tweeted a statement saying: “Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 1101hrs. The baby weighs 8lbs 7oz. The Duke of Cambridge was present for the birth.
“Her Royal Highness and her child are both doing well.”