His behaviours sound a little ASD (Asperger's end of the spectrum). As a teacher, I saw lots and lots of ASD children, but I am definitely no expert. ASD children generally respond really well to familiarity and routine (wearing the same clothes each day) and don't like things to be different (like the boy who ran away because a teacher marked his work in blue pen and not red pen like he was used to). They tend not to pick up on social cues. They have definite favourites and can become 'obsessed' with one thing or find it hard to tune out small distractions (like an itchy clothes tag or a whirring fan - a real problem in a hot classroom!). I'm not sure how old children have to be to be recognised though, he could be way to young for it to be that, it might just be a phase. I'd see your GP, just to be on the safe side. Oh my, I sound like I'm trying to worry you, please don't think that. I am by no means an expert, though ASD children were always my favourites to teach so I made an effort to do some extra training and reading on the subject, that's all.