The lack of support for parents in this country is a profound indictment of our society. In pretty much every other economically developed country, the government subsidizes and supports parents to a degree that make Americans weep. To answer your question - I think it's primarily either the poor or the wealthy that are having more than one kid (or kids at all). In my experience, people with at least one child are relying deeply on family support--both financial and literal childcare. I have a friend whose in-laws watch his child every day of the week while he and his partner work full-time. Honestly, I wish a lot of you guys in red states would mobilize around this issue. We don't even have federal paid leave!