Having friends with children in the age range of 2 1/2 - 6 1/2, I can only relegate my own experience. Basically we've never specifically talked about it, but the first time she saw me in full female clothing (bra, jeans blouse, and skinny jeans) the eldest simply started referring to me as "aunty [my male name]", and she has slowly started to change that latter part. Note that I'm still not full-time, so she is presumably still hearing both my male and female name being toted round. The other kids pretty much took their lead from her, and are surprisingly flexible when it comes to using a "presentation-appropriate" name. 🙂