British Prime Minister Boris Johnson and his fiancee Carrie Symonds have announced the birth of a son.
The child was born at a London hospital, the spokesperson said, adding that mother and baby are doing very well.
“The PM and Ms Symonds would like to thank the fantastic NHS maternity team,” the spokesperson said.
It is understood Johnson, who has just recovered from coronavirus, was present throughout the birth, at the hospital.
He is expected to take a “short period” of paternity leave at some point later this year, Downing Street said.
Johnson returned to work on Monday, after a battle with coronavirus which saw him spend three nights in intensive care. Symonds also suffered symptoms of the disease.
Symonds said on social media that she had spent a “worrying” week in bed with the symptoms of the virus while the PM was self-isolating with the the disease.
She later sent Johnson baby scans and daily messages while he was in hospital, to keep his morale up.
Johnson, 55, and Symonds, 32, announced in March that they were expecting a baby in “early summer”, and that they had become engaged at the end of last year.
Symonds has had a prominent career in politics, and was part of the campaign team that helped to get Johnson re-elected as mayor of London in 2012.
They are the first unmarried couple to move into Downing Street together.
The baby is Symonds’ first child, while Johnson is known to have fathered five.
The last time a child was born to a sitting prime minister was in 2010, when David Cameron and his wife, Samantha Cameron, welcomed their daughter Florence.