It’s a Boy! Duchess of Cambridge Gives Birth to Third Child Kensington Palace announced that Prince William and Princess Kate traveled by car to the private Lindo Wing of St. Mary’s Hospital in central London Monday. The child was born at 11:01 a.m. local time, weighing 8lbs 7oz. Her Royal Highness and her child are both doing well. Kensington Palace The new addition will be fifth in line to the throne, Queen Elizabeth II’s sixth great-grandchild and third grandchild of Charles, Prince of Wales. Catherine and Harry married in 2011 and have two other children, Prince George, 4, and Princess Charlotte, who turns 3 next month.