https://en.wikipedia.org/wiki/The_Female_Brain_(book)
It’s a simple concept but extremely illuminating. Mostly because of natural hormone specifics, females through different stages of development, gravitate toward specific social behaviors that shape their development as people.
She cites the original study (the one this replicated).
Infant girls track their mother’s face and social responses, in a way that boys simply don’t attend to (until many years later)