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by bewaretheirs 1859 days ago
Puberty is the third surge of sex hormones. The first is prenatal, and the second - called "minipuberty" - typically occurs before six months in boys and before two years in girls.

Some discussion in this paper: https://www.karger.com/Article/FullText/508329

(and, yes, it's skeptical that hormones significantly influence behavioral differences between boys and girls - but it's clear that boys and girls have gone through different hormonal trajectories even early in life).