For newbies, the infamous Barrettes and Onsies lecture: "Children know their gender by the beginning of the second year of life. They probably know earlier but they're really pre-pre verbal."https://www.dailymotion.com/video/x7kqndw
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The younger the patients are when they are identified, the more years of medical treatment they’re signed up for - it maximises a lucrative income stream for practitioners.
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