> Feminism want us to believe that taking care of kids is a burden that men unfairly push to women while they go off to have fun at work. And huge parts of society have swallowed it.

No, the feminist position is that childcare is an activity that does not have to be done exclusively by the mother. And so there should be equal and generous time off available for both partners regardless of sex (or if a same-sex relationship, relation to child).

Of course there are biological considerations too. The mother having the opportunity to breastfeed, in particular. So the schedule of leave may be organized around optimizing for this as well.