It's interesting seeing a lot of people from tech culture recently freaking out over birth rates, led by characters like Elon Musk. Yet at the same time they insist on perpetuating an economy that is structurally hostile to reproduction, especially among high achievers (and not just women). They're complaining about a social phenomenon they're driving.
If the economy is a contest to time compress things as much as possible and demand as many working hours from everyone as possible, things like raising children get sacrificed.
This is the simplest explanation for the extraordinarily low birth rates in some countries like South Korea that have normalized insanely demanding work cultures.