I have wondered about this on and off for a long time but I can't work out if I am overreacting.
He is 7.
Things that make me wonder:
He hates loud noises - bursts into tears when an emergency vehicle goes past sometimes, only recently ok with hand driers
He has a range of quirks around going to bed - lights, audiobooks, fan etc
He finds things like being in a small dark space comforting. Also fidget toys
He finds being out of routine/change quite difficult
When he was younger, things like his food being too hot would make him upset
When he was younger, he was just awful about getting changed after swimming because being cold and wet was very difficult
On the other hand:
He is socially fine at school
Academically doing well
Plays well with other children
Basically never violent
I can't work out if he is neurotypical and just a bit quirky or whether there is something else going on