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Boris Johnson's fiancée Carrie Symonds gave birth to a baby boy this morning, with the Prime Minister by her side.

A spokesman for the couple said both mother and baby are "doing very well". It is the couple's first child together.

Mr Johnson, 55, was present for the birth early today at a London NHS hospital but it was not clear when the couple went in. He will take paternity leave later in the year.

“The Prime Minister and Ms Symonds are thrilled to announce the birth of a healthy baby boy at a London hospital earlier this morning. Both mother and baby are doing very well," the spokesman confirmed.

Boris Johnson and Carrie Symonds - In pictures 28 show all Boris Johnson and Carrie Symonds - In pictures 1/28 Prime Minister Boris Johnson and girlfriend Carrie Symonds in the stand at Guinness Six Nations match at Twickenham between England and Wales PA 2/28 Boris Johnson and Carrie Symonds after delivering his speech during the Conservative Party Conference at the Manchester Convention Centre PA 3/28 Prime Minister Boris Johnson and partner Carrie Symonds arrive at the Commonwealth Service at Westminster Abbey, London PA 4/28 Boris Johnson and his partner Carrie Symonds wave from the steps of number 10 Downing Street AP 5/28 Carrie Symonds wearing her engagement ring Rex Features 6/28 Carrie Symonds, partner of Britain's Prime Minister and Conservative leader Boris Johnson, holds their dog, a Jack Russell-cross named Dilyn AFP via Getty Images 7/28 Prime Minister Boris Johnson exits the hall with his girlfriend Carrie Symonds following his keynote speech on day four of the 2019 Conservative Party Conference at Manchester Central Jeremy Selwyn 8/28 Prime Minister Boris Johnson and partner Carrie Symonds arrive at the Commonwealth Service at Westminster Abbey, London Getty Images 9/28 Boris Johnson and his partner Carrie Symonds talk to Lizzie Carr Andrew Parsons/10 Downing Street 10/28 Boris Johnson and his partner Carrie Symonds AP 11/28 Prime Minister Boris Johnson with partner Carrie Symonds and dog Dilyn at the count for the Uxbridge & Ruislip South constituency in the 2019 General Election PA 12/28 Boris Johnson and his girlfriend Carrie Symonds arrive at the Conservative Party Conference Getty Images 13/28 Carrie Symonds, partner of Prime Minister Boris Johnson, waits for a National Service of Remembrance at The Cenotaph Reuters 14/28 Prime Minister Boris Johnson and Carrie Symonds attend the annual Royal British Legion Festival of Remembrance at the Royal Albert Hall AFP via Getty Images 15/28 Prime Minister Boris Johnson exits the hall with his girlfriend Carrie Symonds following his keynote speech on day four of the 2019 Conservative Party Conference at Manchester Central Getty Images 16/28 Prime Minister Boris Johnson and girlfriend Carrie Symonds in the stand at Guinness Six Nations match at Twickenham between England and Wales Reuters 17/28 Prime Minister Boris Johnson and girlfriend Carrie Symonds in the stand at Guinness Six Nations match at Twickenham between England and Wales AFP via Getty Images 18/28 Prime Minister Boris Johnson and his partner Carrie Symonds leave after the annual Commonwealth Service at Westminster Abbey in London Reuters 19/28 Boris Johnson and his girlfriend Carrie Symonds arrive at the Conservative Party Conference Getty Images 20/28 Prime Minister Boris Johnson, with his partner Carrie Symonds, hosting a reception at 10 Downing Street to thank hospice staff for their hard work, dedication and compassion PA 21/28 Prime Minister Boris Johnson's girlfriend Carrie Symonds waits for Boris to arrive at Number 10, Downing Street on July 24, 2019 in London Getty Images 22/28 Prime Minister Boris Johnson embracing his partner Carrie Symonds at the Conservative Party Conference at the Manchester Convention Centre PA 23/28 Carrie Symonds in 2017 Jeremy Selwyn 24/28 Boris Johnson pictured with Carrie Symonds as he leaves the Conservative party Black and White Ball at Natural History Museum Getty Images 25/28 Carrie Symonds, girlfriend of Prime Minister Boris Johnson, waits for his arrival with members of staff in Downing Street Jeremy Selwyn 26/28 Carrie Symonds at the Conservative Conference Manchester in 2019 Jeremy Selwyn 27/28 Prime Minister Boris Johnson leaves with his partner Carrie Symonds after delivering his keynote speech to delegates on the final day of the annual Conservative Party conference at the Manchester Central convention complex AFP via Getty Images 28/28 Prime Minister Boris Johnson walks with his partner Carrie Symonds as they arrive at The Midland, near the Manchester Central convention complex AFP via Getty Images 1/28 Prime Minister Boris Johnson and girlfriend Carrie Symonds in the stand at Guinness Six Nations match at Twickenham between England and Wales PA 2/28 Boris Johnson and Carrie Symonds after delivering his speech during the Conservative Party Conference at the Manchester Convention Centre PA 3/28 Prime Minister Boris Johnson and partner Carrie Symonds arrive at the Commonwealth Service at Westminster Abbey, London PA 4/28 Boris Johnson and his partner Carrie Symonds wave from the steps of number 10 Downing Street AP 5/28 Carrie Symonds wearing her engagement ring Rex Features 6/28 Carrie Symonds, partner of Britain's Prime Minister and Conservative leader Boris Johnson, holds their dog, a Jack Russell-cross named Dilyn AFP via Getty Images 7/28 Prime Minister Boris Johnson exits the hall with his girlfriend Carrie Symonds following his keynote speech on day four of the 2019 Conservative Party Conference at Manchester Central Jeremy Selwyn 8/28 Prime Minister Boris Johnson and partner Carrie Symonds arrive at the Commonwealth Service at Westminster Abbey, London Getty Images 9/28 Boris Johnson and his partner Carrie Symonds talk to Lizzie Carr Andrew Parsons/10 Downing Street 10/28 Boris Johnson and his partner Carrie Symonds AP 11/28 Prime Minister Boris Johnson with partner Carrie Symonds and dog Dilyn at the count for the Uxbridge & Ruislip South constituency in the 2019 General Election PA 12/28 Boris Johnson and his girlfriend Carrie Symonds arrive at the Conservative Party Conference Getty Images 13/28 Carrie Symonds, partner of Prime Minister Boris Johnson, waits for a National Service of Remembrance at The Cenotaph Reuters 14/28 Prime Minister Boris Johnson and Carrie Symonds attend the annual Royal British Legion Festival of Remembrance at the Royal Albert Hall AFP via Getty Images 15/28 Prime Minister Boris Johnson exits the hall with his girlfriend Carrie Symonds following his keynote speech on day four of the 2019 Conservative Party Conference at Manchester Central Getty Images 16/28 Prime Minister Boris Johnson and girlfriend Carrie Symonds in the stand at Guinness Six Nations match at Twickenham between England and Wales Reuters 17/28 Prime Minister Boris Johnson and girlfriend Carrie Symonds in the stand at Guinness Six Nations match at Twickenham between England and Wales AFP via Getty Images 18/28 Prime Minister Boris Johnson and his partner Carrie Symonds leave after the annual Commonwealth Service at Westminster Abbey in London Reuters 19/28 Boris Johnson and his girlfriend Carrie Symonds arrive at the Conservative Party Conference Getty Images 20/28 Prime Minister Boris Johnson, with his partner Carrie Symonds, hosting a reception at 10 Downing Street to thank hospice staff for their hard work, dedication and compassion PA 21/28 Prime Minister Boris Johnson's girlfriend Carrie Symonds waits for Boris to arrive at Number 10, Downing Street on July 24, 2019 in London Getty Images 22/28 Prime Minister Boris Johnson embracing his partner Carrie Symonds at the Conservative Party Conference at the Manchester Convention Centre PA 23/28 Carrie Symonds in 2017 Jeremy Selwyn 24/28 Boris Johnson pictured with Carrie Symonds as he leaves the Conservative party Black and White Ball at Natural History Museum Getty Images 25/28 Carrie Symonds, girlfriend of Prime Minister Boris Johnson, waits for his arrival with members of staff in Downing Street Jeremy Selwyn 26/28 Carrie Symonds at the Conservative Conference Manchester in 2019 Jeremy Selwyn 27/28 Prime Minister Boris Johnson leaves with his partner Carrie Symonds after delivering his keynote speech to delegates on the final day of the annual Conservative Party conference at the Manchester Central convention complex AFP via Getty Images 28/28 Prime Minister Boris Johnson walks with his partner Carrie Symonds as they arrive at The Midland, near the Manchester Central convention complex AFP via Getty Images

“The PM and Ms Symonds would like to thank the fantastic NHS maternity team.”

There was no immediate news of the baby’s name or weight.

The birth comes two days after Mr Johnson returned to Downing Street following a three-week absence due to suffering Covid-19 .

He had been set to make a comeback at PMQs today - which would have been his first clash with Labour leader Sir Keir Starmer - but the new arrival changed his plans.

The PM spent a week in hospital – including time in intensive care – as he battled a serious bout of coronavirus, before joining his fiancée at their Chequers residence.

Earlier this month Ms Symonds, 32, revealed that she, too, had been bedridden with symptoms of the disease, but had made a full recovery.

The pair had been separated for a period due to the sickness, with Ms Symonds said to have sent letters and baby scans to Mr Johnson to boost his morale while he was in care.

The PM’s father, Stanley Johnson, said he was “absolutely delighted” and “thrilled” by the birth of his grandson.

Well-wishers from across the political spectrum also shared their congratulations to the new parents.

Chancellor Rishi Sunak tweeted: “Great to hear Downing Street is getting a new resident.” Labour leader Sir Keir messaged: “Wonderful news. Many congratulations to Boris Johnson and Carrie Symonds.”

Culture Secretary Oliver Dowden posted: “Delighted to hear of the safe arrival of a baby boy to Carrie and Boris. Wonderful news!”

Commons Speaker Sir Lindsay Hoyle said: “On behalf of everyone in the House of Commons, may I say congratulations to the Prime Minister and Carrie Symonds on the birth of their son. Such happy news amid so much uncertainty — 2020 is certainly a year they will never forget. “

Sir Keir Starmer wrote: "Wonderful news. Many congratulations to Boris Johnson and Carrie Symonds."

While the Health Secretary Matt Hancock tweeted: "So thrilled for Boris and Carrie. Wonderful to have a moment of unalloyed joy!"

The couple announced at the end of February that they were engaged and expecting a baby, with the due date set for "early summer."

They have been together since early 2019 and made made history as the first unmarried couple to live in Downing Street after moving in last July

The baby boy is the son's first child together - though not the first new arrival they have bought to live with them in Downing Street. They adopted rescue puppy Dilyn last year, a Jack Russell cross, who moved in shortly after they did.

Mr Johnson and Ms Symonds son is the third baby born to a serving prime minister in recent history .

Tony Blair’s wife Cherie gave birth to son Leo in May 2000 while David Cameron and wife Samantha welcomed daughter Florence in 2010.

The boy is Mr Johnson's sixth child, four of whom he had with his ex-wife.

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Wilfred is the favourite with bookmakers to be the name Mr Johnson and Ms Symonds call their new son. Wilfred, one of the names of Mr Johnson’s grandfather, is 5/1 at Ladbrokes, with George and Thomas at 8/1 and Winston at 10/1.