Some prefectures offer free childcare services, but it depends a lot on where you live. Historically they aren't services that have been used a lot, there is something of a cultural expectation that you or your family watch kids. As an example, babysitters/nannies are basically unheard of unless it is a relative. My girlfriend's sister has a child and either the sister is home all day with the kid or her parents watch it; she even leaves in an prefecture with free daycare services.

There is a fairly decent maternity leave that most new mothers do end up using. There's an initial lump sum payment plus you get about 2/3 your salary for up to a year (I think those times are right). Paternity leave technically exists as well but I have never met anyone who has used it.