It doesn't. But only 20% of mothers want to work fill time as compared to 70% of fathers. 30% of mothers want to not work at all, and 50% want to work part time.

I don't think the argument here is that women make better parents than men. Rather, we live in a free society where men and women make their own choices. And women and men have substantially different work preferences after becoming a parent.

https://www.pewresearch.org/wp-content/uploads/sites/3/2010/...