There’s also a huge lag factor. Decide to have a kid when you are 24, and that kid isn’t in kindergarten until you’re 30. A lot of personal growth & professional growth can happen in that timeframe, improving your circumstances.
Not for a woman, who is will most certainly have to sacrifice professional development if she wants to breastfeed and “be there” for the baby’s first couple years.
A woman’s best bet to acquire financial security is to work through their 20s.