Boris Johnson said it was “tricky” to answer whether or not he would change the nappy of his new baby.
The prime minister and fiancee Carrie Symonds are expecting a child in the early summer.
Appearing on ITV’s This Morning, Johnson said he was “very excited” about becoming a father again.
But he appeared reluctant to discuss his private life, prompting co-host Phillip Schofield to ask: “Is that it?”
When asked: “How good are you at changing nappies? Will you change nappies?”, Johnson eventually replied: “I expect so.”
Johnson would not answer when asked how the rest of his family are taking the news.
“All family life is happening in Downing Street and you won’t talk about it,” Schofield told Johnson.
The prime minister replied: “Very sensibly.”
Johnson added: “I’ve spent an awfully long time deliberately not going on about it, for the very good reason that there are people that I love that I don’t want to put in the debate and that’s the reason.”
On the nappy question, he added: “That was a very tricky one – there was nowhere to go on that one.”
Over the weekend, Symonds told her followers on Instagram she felt “incredibly blessed”.
She said she and Johnson got engaged at the end of last year, “and we’ve got a baby hatching early summer”.