Sweden is also a very small country with only 5mil people or so. Less than some bigger cities have. Something like that wouldnt work in a country with population of 300mil or more.
Actually, thats not true. Overpopulation is only a problem in poor countries with relatively low life expectancy. Most first world countries have the opposite problem. There are too few children and the populations are aging.We do need to strive for a future where every human has access to decent education and healthcare while also teaching Planned Parenthood not having kids for the sake of having kids and to get and stay on benefits and because condoms are against your religion.