The latest addition to the royal family has been named Prince George Alexander Louis, but where did the Prince get his names?
The Duke and Duchess of Cambridge have named their son George Alexander Louis, Kensington Palace said.
With the imminent arrival of the Duke and Duchess of Cambridge's firstborn here are some of the more unusual facts about royal babies.
As congratulations pour in from around the world for the Royal baby, ITV News Border has been congratulating new parents in the region and finding out how the new mothers feel about sharing the day with the Duchess of Cambridge.
We have been to see a number of families with new babies including not quite a day old Benjamin from Keswick.
Watch Kim Inglis' report here:
Baby Iyla Elise was born yesterday, July 22, at the West Cumberland Hospital in Whitehaven. Her mother, Kirsty Messenger, says it is exciting.
Baby Scarlet Harrison was born yesterday, July 22, the same day as the Royal baby. She was born at the West Cumberland Hospital in Whitehaven.
Deputy Prime Minister Nick Clegg has offered his congratulations to the Duke and Duchess of Cambridge after the birth of their son yesterday.
He said: "This is wonderful news. Miriam and I were absolutely delighted when we heard news and we want to send our heart-felt congratulations".
"It's news that will make the country smile", he added.
In a statement issued on their behalf, the Duke and Duchess of Cambridge have thanked hospital staff that helped care for them during the birth of their son.
– The Duke and Duchess of Cambridge
We would like to thank the staff at the Lindo Wing and the whole hospital for the tremendous care the three of us have received.
We know it has been a very busy period for the hospital and we would like to thank everyone - staff, patients and visitors - for their understanding during this time.
Three baby boys were welcomed at Borders General Hospital yesterday, sharing their birth date with the new Royal baby, the Prince of Cambridge.
Kyson Mackie-Brown was the first to be delivered at 03.22am, weighing 8lb 3.5oz.
Hamish Laing was born at 09.22am, weighing 7lb 4.5oz, while baby Jack Johnstone was delivered at 09.40am weighing 5lb 8oz.
Staff at the hospital say the mothers and babies are "all doing well, and are delighted to share their special day with the Royal arrival".
Prince William's close friend, British oarsman Oliver Hicks, has welcomed the "great and happy news" of the arrival of his son.
A statement said: 'What great and happy news to hear the baby has arrived safe and well and Kate's well too. My thoughts are with them all on this momentous day.
"I wish them all good fortune for the future. I'm delighted to be back from the sea to hear the news!."
The Duke of Cambridge has said he "we could not be happier" at the birth of his son.
A Kensington Palace spokesman said Prince William would be staying with the Duchess and their son at the hospital overnight.