Maybe to some extent, but not fully: - Not every birth has an active father involved. - The physical effects of pregnancy will will likely require the mother to take more time off. - Not all men will want to take extended paternity leave. You can try to force them, but that has its own issues, and makes single men more attractive employees.

Mandating that companies pay employees not to work puts them in an awkward position where they're incentivized to discriminate. If government wants to encourage people to have kids, then government should pay parents directly.