Starts with this-
''An individual’s awareness of gender identity, and the emergence of a range of gender-typical behaviours, is usually established by the age of two to three years'.
Gender identity here used to mean societal norms/ stereotypes for sex.
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'By the age of five years, children will spontaneously characterise others by sex (boy or girl). Negative reactions by children to gender diversity in others, which may include teasing,...'
By sex or by external cues- clothes etc? Or a mix of both? Children that age with underwear on not obvious which sex.
Therefore they presumably mean children start thinking boy/ girl according to... A mix of name, what called, referred to as boy, clothing, and at that sort of thing. True that conformity with sex stereotypes is a big thing. Stage in development thing.
**Change of term!!!
NOTE Gender identity (GNC) is now referred to as Gender Diversity. A DIFFERENT term and one used widely by trans orgs etc.
'Such negative reactions may result in psychological distress for the recipient and heighten any gender dysphoria that they might experience.'
I read that as the very common discomfort with some or many aspects of expected behaviour etc and the fact many little children are massively into v narrow boy/girl norms and can be outspoken about non conformity and nasty/ cruel. Ok generally ok... However-
*Change of term!!!
This discomfort etc. First gender identity. Then gender diversity. Now gender dysphoria.