(CNN) Catherine, Duchess of Cambridge, the wife of Britain’s Prince William, has given birth to a son, the royal family announced Monday.
The Duke of Cambridge was present for the birth of the couple’s third child, at 11 a.m. local time at St. Mary’s Hospital in Paddington, west London.
The newest arrival to the royal family weighs 8lbs 7oz (3.8 kilograms), and both mother and baby are “doing well,” according to the Palace.
“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 said in a statement on Twitter.
Prince William left the hospital for a short time Monday afternoon, returning with his other children George, 4, and Charlotte, 2. As the three royals entered the hospital, Charlotte waved over her shoulder at the reporters gathered on the other side of the street.
A golden easel bearing a framed notice announcing the birth was placed on display in front of Buckingham Palace on Monday afternoon. The bulletin will be on display for approximately 24 hours.
The practice of posting a bulletin on the occasion of a royal birth goes back to at least 1837, when Buckingham Palace became the British monarch’s official residence.
The royal baby is fifth in line to the British throne, after grandfather Prince Charles, father Prince William and two siblings.
The newest addition to the royal family is a younger brother to Prince George, 4, and Princess Charlotte, 2, and the Queen Elizabeth II’s sixth great-grandchild.
Prince George was born at the Lindo Wing in 2013, and Princess Charlotte in 2015. Their father William was also born at the same facility.
The duchess’ pregnancy was announced in September. At the time, she was said to be suffering from hyperemesis gravidarum, which involves nausea and vomiting more severe than the typical morning sickness many women suffer during early pregnancy. The duchess was affected by the same condition during her two previous pregnancies.
As her symptoms eased she returned to public engagements, making appearances alongside William, Harry and his fiancee, Meghan Markle.
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CNN’s Laura Smith-Spark and Carol Jordan contributed to this report