It's a Boy: Everything We Know About William and Kate's New Baby Son

Duchess of Cambridge Kate Middleton has given birth to a boy, Kensington Palace reported. It is her third child with Prince William, the duke of Cambridge.

The baby was delivered at the Lindo Wing of St. Mary’s Hospital in Paddington, London, at 11:01 a.m. BST on Monday. His father was present at the birth. Middleton had been taken to the exclusive hospital at around 8:20 a.m.

"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. Her Royal Highness and her child are both doing well," the statement from the palace said.

RTX5W93Y Supporters of the royal family hold dolls wearing crowns outside London's St. Mary's Hospital after Kate Middleton, duchess of Cambridge, gave birth to a son on April 23. REUTERS/Henry Nicholls

It said that the name of the baby, which is fifth in line to the throne, would be "announced in due course" and that "a formal notice of the birth will be posted on the forecourt of Buckingham Palace."

Overseeing the birth were consultant obstetrician Guy Thorpe-Beeston and consultant gynecologist Alan Farthing, senior royal doctors who were also present for the births of Prince George in 2013 and Princess Charlotte in 2015.

The boy will be fifth in line to the throne, following his big brother, 4-year-old Prince George (who is third in line), and big sister Princess Charlotte, 2 years old (who is fourth in line).

The odds on the name of the baby have shifted quickly, with the favorite being Arthur at 2/1, according to William Hill shortly after the birth. Other front-runners include Albert at 9/1, James at 5/1, and Alexander and Jack, which are both 6/1.

Farther down the list of possibilities, according to the bookies, are Fred at 8/1, Phillip at 10/1 and Henry at 12/1. The rank outsiders are Nigel, Thierry and Piers, all at 500/1.