He was the first male of the British royal family to be born in a hospital. Prince Charles also broke with tradition by attending the birth.
Prince Charles and his first wife, Princess Diana, William's mother, arrived at the hospital very early on the morning of the day William was born.
William was born at 9:03 p.m., and weighed 7 lb. 2 oz. A 41-gun salute was fired off in his honor. Princess Diana was back home the next day.
Prince Charles, always restrained, was clearly thrilled. He wrote friends, "I can't tell you how excited and proud I am," adding that he found the newborn William "surprisingly appetising."