From what I see in media more supervision for children (compare to what was norm 25-50 years ago) is a trend across most economically developed countries. But the US is definitely the most extreme case.

I would not be surprised if there is an inverse correlation between birth rate and "child protect" laws - the less children a country have the better it tries to protect (to the point it harms everybody). But child hostile laws (and they abuse by police and social services) like in the US definitely not encourage young people to rise kids.