DS (4.10; asd) has had on and off numerous somewhat a bit unusual body postures.
Today, while we were out at Paultons'park, he adopted something quite new.
A bit hard to describe, but wherever he went to, as we walked around the park he had his left hand on his hip. He was holding it in a slightly bent inwards way; so hard to explain but a bit like a gay person would iyswim? 
He was constantly doing this, and at times was also walking around with his head slightly cocked to the side.
When we were just standing he was always fiddling with his belt, flicking it and wrapping it round his finger.
I suppose this was due to him feeling a bit anxious because it was a big new exciting place with lots of people about.