[ipaddr]

It is probably birth control in the water supply that are causing birth rate declines.

[Godel_unicode]

That has been thoroughly studied and debunked. Just one example of many:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2854760/

Add to this the fact that less than 1% of the estrogen in the water supply is from The Pill.

[amelius]

Yes. I'd be more worried about estrogen in meat.

https://ascopubs.org/doi/abs/10.1200/jco.2010.28.15_suppl.15...

[ipaddr]

That paper used predicted estrogen instead of measuring estrogen. I wouldn't say it has been studied at all based on that link.