Kensington Palace announced the arrival of a boy weighing 8 lbs 6 oz (3.8 kg) at about 8:30 p.m. (2030 BST) on Monday, four hours after his birth, saying Kate and her child were doing well and would remain in hospital overnight. Prince William was with them.
Their son is third in line to the throne after grandfather Prince Charles and father Prince William, 31, and pushes the fun-loving Prince Harry, William's brother, into fourth place.