I read on HN all the time that once you have kid it is unavoidable to spend 300k$ a year. But yet 99.9% of the world and the US manages to raise kids with a fraction of that income and they turn out mostly fine. (Before you ask, yes I have kids and yes we still live simply)
Meanwhile I would bet there is an inverse correlation between spending for the kids and kids happiness.
I certainly agree that it'd be hard to have kids in a small space though, I definitely appreciate having more room - especially with a WFH setup.