Accordimg to the report by UK Evening Standard, 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 report added.
“The Prime Minister and Ms Carrie 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
“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.