Most of my American friends I know turn to the suburbs as a default for "family" style living once they have kids. Imagine their bemusement when they go to a place like Amsterdam or Tokyo and see plenty of families with small children walking around. Heck, you don't even have to go far to see how a city can be a great place for a family, just look at Boston.
Cities, when done correctly, are a better place to raise a family than the suburbs. And yet, when done incorrectly, are terrible.