This seems counterintuitive, but turns out that as infant mortality is reduced, population sizes also decrease, because parents don't need to anticipate that their babies are going to die.
直感に反するかもしれませんが 実は乳児死亡率が下がれば 人口も減るのです 赤ちゃんが死んでしまうことを 親たちが想定せずにすむためです