We have had (my wife and I) various comments recently that our 5 year old son is different. As a back story, he has had a first successful year in reception and previously, a very good year in pre-school. Although he has friends in class (not many), both his teacher and friends have commented that he is 'different'. He is not your atypical boy insofar as he is quite gentle, considerate and reflective. However, he is marginally obsessed with cars and all things engineering based. He often introduces himself to anyone as having an engine and makes various noises citing these as his engine or wheels and so on. He also goes up to other children (in play parks) etc and makes these noises or moves his arms in the pattern of wind-screen wipers (another of his favourites) without saying hello. At home, he has a comfortable, loving environment, interacts/plays with and cares for his younger brother immensely and has not struggled academically. We have put his behaviour down to be being age appropriate, socially underdeveloped (also age appropriate), having a very vivid imagination and most probably lacking in some confidence. Does anyone else have experience of their children behaving in a similar vein ?