I'm not aware of documented cases of confusion I'm basing it solely on my own experience as a parent and someone with a lot of experience of dealing with kids and that is a lot of them have a hard time getting their heads around such issues, in most cases they just shrug their shoulders and...
I understand it and accept it is an issue but the amount of media coverage and focus on transgender issues is totally disproportionate, that and the fact it actually confuses children even more. Kids should be allowed to be kids and do stuff boys and girls do, the ones with transgender issues...