Kate Middleton, the wife of Prince William, gave birth to a boy on Monday at a hospital in London, the third child for the British royal couple.
Kensington Palace said the baby was born at 1001 GMT and weighs 8 lbs 7oz. William was present for the birth at St Mary's Hospital in west London where their other two children, George and Charlotte, were also born, it added.
"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.
"Her Royal Highness and her child are both doing well."
The new prince is Queen Elizabeth's sixth great-grandchild and fifth-in-line to the British throne behind siblings Prince George, 4, his two-year-old sister Princess Charlotte, their father William, and grandfather and heir Prince Charles.
A 2013 change to the law means the boy will not supplant older sister Charlotte in the line of succession.
"That would in fact be the first time that has ever happened," royal historian Huge Vickers said.
However, William's younger brother Harry, who marries U.S. actress Meghan Markle next month, falls to sixth on the list.
Kensington Palace said the name of the new royal would be announced in due course. Bookmakers had made Albert, Arthur, Jack and Fred the favorite names for a boy.
As with her two previous pregnancies, Kate, 36, suffered from hyperemesis gravidarum, an extreme form of morning sickness which can cause severe nausea and vomiting and requires supplementary hydration and nutrients.
Kate's last engagement ahead of the birth was on March 22 when she and William attended a number of events in London to celebrate the Commonwealth ahead of a meeting of its leaders last week.
The baby was be born at the private Lindo wing of St Mary's, where maternity packages cost in the region of 6,000 pounds ($8,400). William, 35 was born at the same hospital to the late Princess Diana in 1982.
In keeping with tradition, the official announcement of the birth was made by placing a notice on an easel in the forecourt of the queen's London home, Buckingham Palace.
William and Kate met as students at St Andrews University in Scotland. They got married in a pageant-packed ceremony at Westminster Abbey in April 2011 and have since become well-known across the global stage.
Having had homes in north Wales and Norfolk in eastern England, William and Kate now live at Kensington Palace to allow the prince to dedicate more time to royal duties on behalf of his grandmother.
Last year William gave up his day job as an air ambulance pilot to concentrate on his official role, having faced some criticism from British newspapers who dubbed him "workshy Wills".
However, he has also been determined to play a hands-on role in bringing up his children while also protecting their privacy, an issue close to his heart after his mother's death in a 1997 Paris car crash as her limousine sped away from chasing paparazzi.
"I think he takes on a lot more engagements than he used to," said royal biographer Claudia Joseph.
"But compared to members of the general public who have full-time jobs, he still has some time off to look after the children, to give them their baths, to put them to bed and I think he'll continue to do that," Joseph said.
The British royals are rarely out of the media glare, but the baby arrives at a time when the Windsors have particularly been in the limelight.
On Saturday William joined the queen and other senior royals, with the exception of Kate, as the monarch celebrated her 92nd birthday at a televised concert.
The queen also played a prominent role at the Commonwealth Heads of Government meeting in London last week, where it was announced that Charles would succeed her as head of the network of mainly former British colonies.
The wedding of William and Kate and the birth of Prince George, who is destined to be a future king, generated a worldwide media frenzy. While interest in their third child has been more muted, large numbers of photographers and broadcasters were massing outside the hospital in anticipation of the new royal arrival, along with some dedicated royal fans.
"We’ve been camped here outside the hospital for 15 days," said John Loughrey, 63, from south London, who was wearing a Union Jack onesie and hat and holding a baby doll adorned with a crown that said 'feed me mummy' every few seconds.
"We’ve been coming out doing this for 21 years. We were here for George and Charlotte and we'll be there for the royal wedding too," he said, referring to Harry and Meghan Markle.
The birth will give Kate's own family another cause for celebration after it was reported by British media on Sunday that her sister Pippa was pregnant with her first child.
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