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Childhood gender nonconformity (CGN) is a phenomenon in which prepubescent children do not conform to expected gender-related sociological or psychological patterns, or identify with the opposite sex/gender. Typical behavior among those who exhibit the phenomenon includes but is not limited to a propensity to cross-dress, refusal to take part in activities conventionally thought suitable for the gender and the exclusive choice of play-mates of the opposite sex.

Multiple studies have correlated childhood gender nonconformity with eventual homosexuality; in these studies, a majority of those who identify as gay or lesbian self-report being gender nonconforming as children.[2][3][4] The therapeutic community is currently divided on the proper response to childhood gender nonconformity. One study suggested that childhood gender nonconformity is heritable.[4]