I think one-child policy is a good policy.In my opinion,it has many advantages.And too many people may cause many social problems.For instance,in africa,most children are skinny,they don’t have enough resources,such as food,water,education,medical treatment and so on.Besides,crime rate is so high that safety there can't be ensured.Of course,with onechild policy,life will be improved because everyone can own more resources.However,every coin has two sides.Parents may dote on the only child,children will be harder to get along with.As is mentioned above,one-child policy is a good policy.