LONDON (CBS/CNN) – The Duchess of Cambridge has given birth to a baby boy at London’s Saint Mary’s Hospital.

The newborn weighs 8 lbs 7 oz (3.8 kilograms).

The duchess, the former Kate Middleton, gave birth at 11 a.m. local time at St. Mary’s Hospital, Paddington, London.

The baby is the couple’s third child. He joins older siblings 4-year-old Prince George and 2-year-old Princess Charlotte, who were born at the same hospital.

Their father William was also born at the same facility.

The baby will be fifth in line to the British throne, after grandfather Prince Charles, father Prince William and two siblings.

Prince William and Duchess of Cambridge’s newest addition to their family is Queen Elizabeth II’s sixth great-grandchild.

Earlier Monday morning, it was announced that the Duchess of Cambridge was admitted to hospital in the early stages of labor.

The Duchess was driven by car from her official residence at Kensington Palace to the private wing of a central London hospital — coincidentally St. George’s Day, the feast day of the patron saint of England.

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.

The development comes just weeks before the wedding of Harry and Markle at St. George’s Chapel in Windsor on May 19.

William and Kate will mark their own seventh wedding anniversary on April 29.

The news of a royal birth is traditionally announced on a gilded easel placed outside Buckingham Palace. Large crowds gathered outside in July 2013 to see the announcement of the arrival of William and Kate’s first child.

The couple announced his name, George Alexander Louis, and that of their daughter, Charlotte Elizabeth Diana, a couple of days after each was born.

Among bookmakers’ favored names for the couple’s third child are Arthur, Albert and Frederick for a boy, and Mary, Alice and Alexandra for a girl.

(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. CNN contributed to this report.)