Answer:
The two child rule is simply that....two children per family. Honestly, nothing about this rule should be changed. We can see examples from other countries, especially America, where many children are left hungry and/or unloved due to too many in one family. By having two children in one family, each child can get the necessary love and care they need to grow up living a prosperous life. If one thing needed to be changed, perhaps the fee for having more then two children could be decreased a bit, but apart from this, this rule should be kept just as it is: perfect.
(This is a short answer as I'm kind of doing an exam, but I hope it still helps!)