> Nope. It's universal. The denser the city, the more child-hostile it is.

Maddy Novich, https://www.instagram.com/cargobikemomma/, for one, may disagree with you. Interview:

* https://www.youtube.com/watch?v=5PoKcQRlDGs

She has three kids IIRC.

> Just imagine getting into Tokyo subway with a stroller for 2 kids. There's a reason why Tokyo fertility rate is below 1.

Hong Kong has always been dense, and it used to have a fertility rate of ~5:

* https://fred.stlouisfed.org/series/SPDYNTFRTINHKG

Further, all US states, regardless of how urban or rural they are, have fertility rates with basically the same slope:

* https://en.wikipedia.org/wiki/List_of_U.S._states_and_territ...

In every industrialized, Western-ish society rates dropped during the 1970s, regardless of initial or final density.