Our ethic growing up was you don't have babies unless you can afford them. Of course the outsourcing by globalist agenda supporting presidents in recent years (Clinton, Bush, Obama) has removed the jobs that would enable millions of young people to work and own homes and raise kids, too.
The world is over-populated and when does sustainability become an issue? When does the whole thing collapse? Some might say it's starting already.
I'll theorize that the ideal is populations expand, then as civilization advances, birthrates naturally go down as women "get a life," go out and work. Then, automation enables a lower, more sustainable population count as automation assumes jobs. But, we have an economic system that requires expansion. So I can't see how we resolve the two.
I can't get my arms around the whole picture, frankly.