LONDON (AP) — The Latest on the royal baby birth (all times local):
Prince George and Princess Charlotte have arrived at London's St. Mary's Hospital to meet their new baby brother.
Prince William left the hospital Monday afternoon and returned half an hour later with his two elder children.
George, who is 4, wore the navy blue shorts and sweater of his school uniform, and ignored the waiting media and well-wishers. Charlotte, who is almost 3, gave the crowd a wave as the family entered the hospital's private Lindo Wing.
The Duchess of Cambridge gave birth to an 8-pound, 7-ounce (3.8 kilogram) baby boy on Monday morning. The new baby is fifth in line to the throne, behind his brother and sister.
Prince William has left St. Mary's Hospital five hours after the birth of his third child, promising to return soon — likely with his older children in tow.
William said "back in a minute" as he emerged from the hospital just after 4 p.m. (1500 GMT; 11 a.m. EDT), waved at gathered media and well-wishers and drove off in a waiting Land Rover.
There's expectation he will bring 4-year-old Prince George and Princess Charlotte, who turns 3 next week, to meet their baby brother.
William's wife, the Duchess of Cambridge birth, gave birth to a son just after 11 a.m. (1000 GMT; 6 a.m. EDT) Monday.
British Prime Minister Theresa May has offered "warmest congratulations" to Prince William and the Duchess of Cambridge on the birth of their new son.
May says that "I wish them great happiness for the future."
The couple's Kensington Palace office says Kate gave birth at 11:01 a.m. (1001 GMT; 6:01 a.m. EDT) to a boy weighing 8 pounds, 7 ounces (3.8 kilograms). The baby is the couple's third child and is fifth in line to the throne.
The news brought cheers from dedicated royal-watchers outside London's St. Mary's Hospital, where a self-appointed town crier proclaimed the birth.
The words "it's a boy" were flashed in lights around the top of London's BT Tower, which can be seen for miles around.
Kensington Palace says the Duchess of Cambridge has given birth to her third child, a boy weighing 8 pounds, 7 ounces (3.8 kilograms).
The palace says the child was born at 11:01 a.m. (1001 GMT; 6:01 a.m. EDT), a few hours after Kate was admitted to London's St. Mary's Hospital in labor.
Prince William was present for the birth of his son, who is fifth in line to the throne.
The palace says "the queen, The Duke of Edinburgh, the Prince of Wales, the Duchess of Cornwall, Prince Harry and members of both families have been informed and are delighted with the news."
Kensington Palace says Prince William's wife, the Duchess of Cambridge has entered a London hospital to give birth to the couple's third child.
The former Kate Middleton traveled by car on Monday morning to the private Lindo Wing of St. Mary's Hospital in central London. The palace says she was in "the early stages of labor."
The gender of the baby hasn't been announced.
The couple, who married in 2011, has two other children: Prince George, 4, and two-year-old Princess Charlotte. Both were born at the same hospital, as were William and his younger brother Harry.