Our expert says:
Some such experimenting at around 3 ( which sounds like when you say this was starting ) usually isn't serious. But for this to have persisted for 3 years, suggests the kid is confused about his gender identity, probably among other issues, and would really benefit from seeing a child psychologist or child psychiatrist for a proper assessment and specific advice based on the results of such an assessment.
It's no a matter of you doing or having done something wrong. There may or may not be some sexual aspects ( as distinct from gender aspects ) to this behaviour.
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