Prince Harry beams after birth of his and Meghan Markle's son

Britain's Prince Harry was clearly delighted as he spoke Windsor Castle to announce the birth of his and Meghan's baby boy. Photo / AP

A delighted Prince Harry has spoken of his joy at being a dad and his pride in his "incredible wife".

Speaking from Windsor, the Duke of Sussex said: "I'm very excited to announce that Meghan and myself had a baby boy this morning, a very healthy baby boy...Mother and baby are doing incredibly well."

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This afternoon, His Royal Highness The Duke of Sussex shared the news of the arrival of his and the Duchess’ first born child. Their son was born early morning on the 6th of May, 2019 and weighs 7lbs and 3oz. Their Royal Highnesses thank you for your support and kindness during this exceptionally joyful time in their lives as they welcome their baby boy.

A post shared by The Duke and Duchess of Sussex (@sussexroyal) on May 6, 2019 at 9:17am PDT

He said: "It's been the most amazing experience. We are both absolutely thrilled and grateful to the support from everybody out there."

Prince Harry said they were still thinking about names but would show off their baby in the two days' time.

The Duke of Sussex added: "It's absolutely incredible and I'm so incredibly proud of my wife."

Harry, who was present for the birth, said his son was "absolutely to die for...I'm absolutely over the moon".

The birth was announced, as expected, on the couple's new Instagram page. A formal announcement followed soon after.

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We are pleased to announce that Their Royal Highnesses The Duke and Duchess of Sussex welcomed their firstborn child in the early morning on May 6th, 2019. Their Royal Highnesses’ son weighs 7lbs. 3oz. The Duchess and baby are both healthy and well, and the couple thank members of the public for their shared excitement and support during this very special time in their lives. More details will be shared in the forthcoming days.

A post shared by The Duke and Duchess of Sussex (@sussexroyal) on May 6, 2019 at 6:37am PDT

"Her Royal Highness The Duchess of Sussex was safely delivered of a son at 0526hrs (2.26pm Monday AEST)," Buckingham Palace said in a statement. "The baby weighs 7lbs 3oz (3.26kg).

"The Duke of Sussex was present for the birth."

The statement continued: "The Duchess and baby are both healthy and well, and the couple thank members of the public for their shared excitement and support during this very special time in their lives.

More details will be shared in the forthcoming days," they posted on Instagram.

Meghan's mum Doria Ragland was by her side during the birth, having flown in to the UK from Los Angeles late last month.