[Apocryphon]

Yeah, improvements to quality of life and socioeconomic development lead to lower fertility. Pretty sure this is an Industrial Revolution phenomenon that predates chemical contraception.

[User23]

There was a moderate downward trend over a couple centuries from around 7 to 4 children per woman. And then in the ‘60s it fell off a cliff[1].

[1] https://data.worldbank.org/indicator/SP.DYN.TFRT.IN?location...