I used to live in France (and my brother still lives there) and long hours are kind of expected. I now live in the Netherlands and we actually _almost_ got in trouble with the daycare for bringing our kid there 5 times a week because we were both working full time. Most people I know (agreed, as engineers we are privileged) work 4 days a week and won't do over time.
If you ask me, that makes a lot of sense. I get done in 8 hours what I used to do in 10. And next to that I have a life.
In any case, don't let anyone make you feel bad for having kids. They're much better than any career you can dream and don't let 'management' take that away from you.