And it is not like the Chinese govt didn't try, they were serious about it. It's just that birth rates are mysterious. People will have kids when they want to, and will stop having kids when they want to, and they will listen to nobody. No authority.
Fertility rate: https://fred.stlouisfed.org/series/SPDYNTFRTINCHN
Birth rate: https://fred.stlouisfed.org/series/SPDYNCBRTINCHN
And it is not like the Chinese govt didn't try, they were serious about it. It's just that birth rates are mysterious. People will have kids when they want to, and will stop having kids when they want to, and they will listen to nobody. No authority.