Harry and Meghan reveal name of new royal arrival

- How baby debut broke with tradition

The Duke and Duchess of Sussex have named their son Archie Harrison Mountbatten-Windsor.

The couple's @SussexRoyal Instagram account announced: "The Duke and Duchess of Sussex are pleased to announce they have named their first born child: Archie Harrison Mountbatten-Windsor

"This afternoon Their Royal Highnesses introduced Her Majesty The Queen to her eighth great-grandchild at Windsor Castle. The Duke of Edinburgh and The Duchess' mother were also present for this special occasion."

The family of three were pictured in a black and white snap showing off baby Archie to the Queen and Philip, alongside Meghan's mother Doria Ragland.

Harry and Meghan's first born, who is seventh in line to the throne, made his world debut with his besotted parents at Windsor Castle on Wednesday.

The royal baby
The Duchess of Sussex places her hand next to her baby son (Dominic Lipinski/PA)

Proud mother Meghan described him as having the "sweetest temperament", while a delighted Harry called him "our own little bundle of joy".

The duchess added: "It's magic, it's pretty amazing. I have the two best guys in the world so I'm really happy."

As is the custom for royal babies, Harry and Meghan will have shared news of their choice with the monarch before releasing it to the public.

The baby's great-grandmother the Queen
The Queen at the Royal Windsor Horse Show on Wednesday (Andrew Matthews/PA)

The duke and duchess's son arrived on Monday May 6 at 5.26am, weighing 7lb 3oz.

Harry said, when announcing the birth, that the baby's late arrival had given them longer to decide on a name.

"The baby is a little bit overdue, so we've had a little bit of time to think about it," he said.

Among the bookmakers' favourites were Alexander, Arthur, Albert, as well as James and Philip, while Spencer was a late favourite, but Archie was a surprise choice.

By deciding to call their son Archie Harrison Mountbatten-Windsor, Harry and Meghan have chosen not to use a title for their first born.

As the first born son of a duke, Archie could have become Earl of Dumbarton – one of Harry's subsidiary titles – or have been Lord Archie Mountbatten-Windsor, but instead he will simply be Master Archie Mountbatten-Windsor.

A source said: "They have chosen not to use a courtesy title."