Their Royal Highnesses the Duke and Duchess of Cambridge have named their new baby Louis.

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The Duchess of Cambridge had given birth to a baby boy on Monday morning, 23rd April, at 11:01 am, and showed the new baby to the world in a short appearance on Monday evening.

But it took until Friday morning for the baby’s full name to be announced as Louis Arthur Charles – to be known as Prince Louis of Cambridge.

The names Albert and Arthur had been the bookies’ favourites, with Louis – which is one of Prince William’s middle names, and the name of Prince Philip’s maternal grandfather – listed at 14/1.

Louis was also the name of the late Lord Mountbatten, uncle of Prince Philip and second cousin once removed of The Queen, who was assassinated by the IRA in 1979.

Kensington Palace shared the news of the birth on Monday morning via Twitter, adding that the baby weighed 8lb 7oz and that Prince William was present at the birth.

And after a long wait at St Mary’s private hospital in London, the royal couple came out for the now-traditional ceremony of introducing the baby to the public.

LONDON, ENGLAND – APRIL 23: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, pose for photographers with their newborn baby boy outside the Lindo Wing of St Mary’s Hospital on April 23, 2018 in London, England. The Duke and Duchess of Cambridge’s third child was born this morning at 11:01, weighing 8lbs 7oz. (Photo by Jack Taylor/Getty Images)

LONDON, ENGLAND – APRIL 23: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn son at St Mary’s Hospital on April 23, 2018 in London, England. The Duchess safely delivered a son at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Karwai Tang/WireImage)

LONDON, ENGLAND – APRIL 23: Catherine, Duchess of Cambridge departs the Lindo Wing with their newborn son at St Mary’s Hospital on April 23, 2018 in London, England. The Duchess safely delivered a boy at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Samir Hussein/WireImage)

LONDON, ENGLAND – APRIL 23: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, depart the Lindo Wing with their newborn son at St Mary’s Hospital on April 23, 2018 in London, England. The Duchess safely delivered a boy at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Gareth Cattermole/Gareth Cattermole/Getty Images)

HRH Prince George and HRH Princess Charlotte were among the first visitors to see the new baby, with Prince William fetching them himself from Kensington Palace during the afternoon and bringing them to the hospital.

(180424) — LONDON, April 24, 2018 (Xinhua) — Britain’s Prince William (2nd L), Duke of Cambridge arrives with Prince George (1st L) and Princess Charlotte (2nd R) to visit Britain’s Catherine, Duchess of Cambridge, who has given birth to a baby boy at St Mary’s Hospital in London, Britain, on April 23, 2018. Princess Kate on Monday gave birth to a boy, her third child, who is the fifth in line to the British throne. (Xinhua/Stephen Chung)

It is the third baby for the Duke and Duchess of Cambridge, following the births of Prince George and Princess Charlotte in 2013 and 2015 respectively.

The baby was born in the Lindo Wing at St Mary’s Hospital in London, where the baby’s father, two siblings and uncle HRH Prince Harry were all born.

Prince William and Prince Charles arrive at St. Mary’s Hospital on September 15th, 1984 Paddington, London, England to visit his newborn brother Prince Harry, in the Lindo wing with his mother Diana, Princess of Wales. (Photo by Tim Graham/Getty Images)

Diana, Princess of Wales holds Prince Harry as she and Prince Charles, Prince of Wales leave the Lindo Wing at St Mary’s Hospital in Paddington (Photo by Tim Graham/Getty Images)

Prince Charles, Prince of Wales and Diana, Princess of Wales leave the Lindo Wing St Mary’s Hospital with baby Prince William on July 22, 1982 in London, England. (Photo by Anwar Hussein/Getty Images)

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn daughter at St Mary's Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by Chris Jackson/Getty Images)

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn daughter at St Mary’s Hospital on May 2, 2015 in London, England. The Duchess was safely delivered of a daughter at 8:34am this morning, weighing 8lbs 3 oz who will be fourth in line to the throne. (Photo by Chris Jackson/Getty Images)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary’s Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images)