The "Theory of Everything" star said he initially wanted to find out the gender of his first child but his wife Hannah Bagshawe quickly expelled the thought, reported Femalefirst.
"It's gonna be a surprise. I was like, 'Maybe we should find out?', but my wife was like, 'We are not finding out', so she wears the trousers. (It's) one of the great surprises that still exists in the world."
And the 34-year-old actor has been so busy that he hasn't had a chance to check out the parenting guide he's been given but he isn't too worried as they have "a while" before the baby is due.
staring guiltily as we should be learning how to be parents, but we haven't opened them yet. We have got a while.