Don’t forget paternity leave, and leave for any couple when adopting a baby.
I think an even-handed approach would be best — the leave for a pregnant worker should be precisely equal to the leave for a male worker whose wife is pregnant.
Then the question becomes: is this a good idea?
I think fewer people would say “Yes”, and I’m sure a lot fewer feminists would say “Yes”. But any other approach is a sexist approach which picks winners and losers between the sexes. And we can’t have that.
And leave caring for an aging parent. And leave caring for the handicapped anyone. Yes, let’s redistribute it all!