1/2 child policy

I found out that
1)There are advantages and disadvantages for having a lot of children.
2) If the population of your country is too high, there will be problems, such as overcrowding, which may lead to spreading of diseases, thus having an unsafe country.
3) Having a 1 child policy will cause a huge drop in the population in long term.
Perceptions I have gained
1) Currently in Singapore, since we do not have an extremely small or large population, so I like the fact that we have the freedom to choose how many children we want.
2) However, in a country like China, restrictions are for the country's good and thus, I agree with China's decision and policy.
One question I have
1) Will there ever be a policy where married couples must have a minimum amount of children?