The difference is payment of time in care work, and not just for childcare but also for other forms of care (disabled, elderly).
Another very big issue is poverty. Time used for raising children doesn't count into pension payments, meaning that women who divorce from their husbands end up without anything in their name in the worst case.
Another very big issue is poverty. Time used for raising children doesn't count into pension payments, meaning that women who divorce from their husbands end up without anything in their name in the worst case.