This is a tricky question for me. I'll be 25 when I start, if I get into a PhD program with some funding for fall '10. I'd like to have kids when I'm 29 or 30ish, just because it seems like a nice age to become a parent. Also, I'd like to have 3 kids, ideally, so if I'm not gonna be too old when I (or my girlfriend, yup I'm gay) have the kids.
Right now I'm doing an MA at a Swedish university, where the doctoral students are considered employees. They get parental leave up to 16 months, to be shared between the parents (at least 2 months must be taken by the dad/other parent). I don't really have much of an idea of how this works for PhD students in the US-- is there any sort of leave allowed? Or do people just continue studying after the baby is born? I assume if you take leave, you don't get any sort of paid leave as you do in Sweden.
It would be helpful to hear from someone who has gone through this!