During residency we do not have much control over the hours we work. I was lucky enough to plan both my pregnancies during residency to avoid the most grueling rotations when my fundal heights were peaking. Then again, you also have to consider the possibility of having a complicated pregnancy and the kind of situation that may bring, e.g. if you had preterm labor and required extended time off work, which may mean you spend extra time in residency or working extra call after returning to work. Once in private practice there is alot of flexibility. You can join a smaller group, more call but maybe not as busy.
Academics usually can work well too.
I have a 4 day work week, we always have one day off a week and one half day for surgery only. It works really well for me. What's important is deciding what your comfortable with. Her mom takes care of the kids as well as her husband who works only part time. MomMD does not provide medical advice or information.