Probably deserves another thread, but this is an interesting article.

https://www.bbc.com/news/articles/clynq459wxgo

I'm a big Wikipedia geek and one consistent page they do is "demographics of X country", and within that they list births and deaths each year.

The figures in a lot of countries are staggering. Not uncommon for a third less births from before Covid, some countries getting on for half the births from the early 2000s.

What is striking is that whilst far from universal, it is happening across the west, so it's hard to pin it down.

As an example:
Spain. 322,000 births in 2023. 520,000 births in 2008.

https://en.m.wikipedia.org/wiki/Demographics_of_Spain