I found sources.
The word “man” was gender neutralandreferred to both sexes until the 13th century
The female specific pronoun “she” was invented in the 12th century.
The word “girl” was gender neutralandreferred to children of both sexesuntilthe 15th century
High heels were invented for menandwere worn predominantly by men until the 16th century
From the mid 16th century to the 19thcenturyboys would typically wear dresses until the age of 7
Until the early 1930spink was considered the appropriate colour for baby boysandblue was the colour for baby girls
In 2017, a Christian couple pull their 6yo son out of a primary schoolbecausehis classmate is transgender -citing their “traditional beliefs” IMPORTANT NOTE: Last source is transphobic and from a pro-life website that attempts to defend the dumb ass couple. Feel free to ignore it if you prefer, but it was included for the sake of accuracy.
Reblogging because verifiable sources make every information 70% better. Thanks for the addition!