Young Wilfred Lawrence Nicholas Johnson may be just a few days old, but it's already clear he's inherited one of his dad's most famous features.
Proud mum Carrie Symonds, who gave birth on Wednesday, posted a picture of the newborn on Instagram.
Wrapped in a blanket, the infant sported a full head of light brown hair - similar to the blond locks of the Prime Minister.
Ms Symonds, the PM's fiancee, wrote: "Introducing Wilfred Lawrie Nicholas Johnson born on 29.04.20 at 9am.
"Wilfred after Boris' grandfather. Lawrie after my grandfather.
"Nicholas after Dr Nick Price and Dr Nick Hart - the two doctors that saved Boris' life last month.
"Thank you so, so much to the incredible NHS maternity team at UCLH that looked after us so well.
"I couldn't be happier. My heart is full."
The engaged couple welcomed their first child together on Wednesday morning when the newborn apparently arrived weeks earlier than expected.
Ms Symonds, 32, had previously said that the baby was due in the early summer, leading to the belief that the due date was in June.
Mr Johnson, 55, was hospitalised with coronavirus and spent three days in intensive care in April.
A spokeswoman for the couple said the "healthy" baby boy was born at an NHS hospital in London. Both mother and baby were said to be "doing very well".
The PM said he would take a "short period" of paternity leave later in the year.
New fathers are entitled to up to two weeks of statutory paternity leave.
It must end within 56 days, or eight weeks, of the birth, a period that would take Mr Johnson to the last week of June.
