Everyone knows. Stop contraception, stop woman education, stop abortions, reduce woman rights to 1800. Remove children rights, make environment where children are productive and bring profits to their parents, so they have financial incentive to create children.
Right, if anyone here has taken a human geography course this is the obvious answer. This is why birthrate was so high for so long. As nations developed and gained rights for women, it went lower and lower and lower.
And it makes complete sense. The reality is having a child kind of sucks for a woman, and I, nor anyone else, can blame a large portion of women for just saying "eh... no". I would probably say no, too, although it's hard to tell, because I'm not a woman.
Having children was once a boon, because conditions were shit. Now it's a burden. So, people will treat it as a burden.
Either make it less burdensome or revert women. Nobody wants to do the latter, so we must do the former. We have to invest in children, because children are a Nation's investment.
No one wants to implement it.