Tim Keller considers the reasons for declining birth rates:
In Japan, in Western Europe, and in Russia, the birth-rate has fallen precipitously, to below replacement levels. If this does not change, the economic and cultural impact will be very great on those nations. Many have pointed out that interest in child-bearing is lowest in the most secular countries and sectors of society, while it is the highest in the most religious countries. Why is this? One explanation is that more educated people put off child-rearing until later in life and that means fewer children. However, educated religious people have more children than educated secular people, and therefore the socio-economic answer isn’t the most basic answer. I don’t think anyone can be completely sure that they have a handle on this complex phenomenon, but I think it creates an interesting backdrop for the consideration of the unique Christian view of the family.
Read the rest here.