My grandson has been hand flapping since 3 mo. old. He is 18 mos. old and started to walk at 16 mo. he still hand flaps, especially when excited but appears to be the only child in any given group to flap. I have noticed a slight inbalance to his walking. Lately he has been sticking fingers in ears. He does hear well - I think he does it to hear the difference. This past week he has been crawling when he could be walking - am I overly worried or is there something to be concerned about. Oh yes, he is very affectionate, curious and gives eye contact.