Every day my 4.5yr old and I race to school (he always beats me). Today there was a little girl ahead of us using a walker. I didn't feel right running past her so made DS walk. DS informed me "that's a boy with a girls backpack" because her hair was growing back. I tried to correct him and then told him we'd talk about it later. We live in a small town so I'm sure he will be around her frequently. How do I explain the situation to him? I hate to use the word sick. I want to tell the truth but in a very sensitive way. I don't want him to see her as different. IDK. Any advice?