The birth announcement, via a press release from Kensington Palace, said the boy was born at 4:24 p.m. weighing 8 pounds 6 ounces.
The infant will become third in line for the British throne after Prince Charles and William.
Kate checked into a private wing at St. Mary’s Hospital in central London early Monday morning.
William spent the long hours of labor at her bedside. This is the couple’s first child.