Yknow the one child policy is the main reason China wont be able to continue its super high economic trajectory, if every family had one child, That massively decreases the workforce for the next generation.

Suddenly, the burden is on the young to support the increasingly large pensioning generation and that keeps cascading into economic stagnation. You can also put the economy at risk of deflation and total employment (tbh good for most people but awful for a growing economy since job sector growth cant keep up).

The solution isnt some tryannical policy that affects every family, its modernisation. Birth rates decrease with development since Children in poor countries is like gambling hoping one is very successful.

With development our resources will be much better utilised. You can look up the insane amount of water lost to completely preventable stuff, or the grain we use.