Take a look at Scandinavian countries that have the highest levels of gender equality. When women are given the most freedom, they choose to spend more time raising children than men, and they choose less demanding jobs than men. Women and men have overlapping interests but women tend towards children.
This is the scientific answer. The 'hey, im old now answer' is from life. Most of the women I worked with have exited (80% not in tech nor working), and the women in my friends group are raising kids rather than some shit job.
You might want to take a look at the cost of Kindergarten or similar care. People I know (in Germany though) made this calculation: to work and pay what I earn for Kindergarten or one of us does not work and takes care of the kids.