The total fertility rate has fallen well below the “replacement rate” (needed to keep a population constant). But that may not be a cause for concern https://t.co/tg3rdcpZw0 ...

The “total fertility rate” effectively assumes that a young woman will have babies not only at the same rate as her contemporaries, but also at the same rate as women five or ten years older. That is not necessarily so https://t.co/TNTr7uxDmG ...