> You think there'd be ...some? people talking about how they decided not to have a child because she/he wouldn't fit in the car if it's going to have a measura

> You think there'd be ...some? people talking about how they decided not to have a child because she/he wouldn't fit in the car if it's going to have a measurable effect on birth rates but at least personally I have never, ever heard this one. We have 3 kids. When talking to friends with only 2 kids, this comes up all the time and is a non-trivial concern in having a third child. You need a bigger car, a bigger house and bigger everything, and many things are not geared towards families of 5 - family passes at museums/zoos are often 2 adults + 2 children etc. When we had our third we upgraded our car (from 5 seats to 8 seats) and our house. If we had a fourth we'd need to upgrade the house in a few years again. It's definitely a concern and is definitely talked about by people who are affected by it.