Since this is a very politicized topic, as a Muslim I feel it is worth pointing out that there is nothing in Islam that promotes having many children per se (this topic is even omitted in the linked Wikipedia article).
On the contrary, Islam does not forbid contraception or even abortion, up until four months of gestation.
On the contrary, Islam does not forbid contraception or even abortion, up until four months of gestation.
The trend described is highly socioeconomic.