Lots of evidence people just don't want kids, of both genders. Educated, empowered women have less kids, or no kids, and delay having kids when they do have them. Contraception availability is robust, teen pregnancies are down, the population boom was an anomaly. Fertility rates are declining because unintended (~40% annually per the Guttmacher Institute and the UN) and unwanted children rates are falling off a cliff. Maternal instinct in humans is a myth. More support for parents does not appear to increase fertility rates. Citations below.

https://ourworldindata.org/fertility-rate#what-explains-the-... ("Our World In Data: What Explains the Declining Fertility Rate?")

https://www.bbc.com/worklife/article/20230208-the-adults-cel... ("BBC: The adults celebrating child-free lives")

https://www.psychologytoday.com/us/blog/why-bad-looks-good/2... ("The Guardian: Why So Many Single Women Without Children Are Happy")

https://www.theguardian.com/lifeandstyle/2019/may/25/women-h... ("Women are happier without children or a spouse, says happiness expert")

https://www.axios.com/2024/07/25/adults-no-children-why-pew-... ("Axios: Why more U.S. adults are choosing not to have kids")

https://www.pewresearch.org/social-trends/2024/07/25/the-exp... ("Pew Research: 57% of adults under 50 who say they’re unlikely to ever have kids say a major reason is they just don’t want to; 31% of those ages 50 and older without kids cite this as a reason they never had them; 64% of young women say they just don't want children, compared to 50% of men.")

https://www.ft.com/content/838eeb4e-3bff-4693-990f-ff3446cac... | https://archive.today/s6zUk ("Financial Times: Why family-friendly policies don’t boost birth rates")