JFL, used to do all of that when I was a kid:
-I used to walk on my toes like a fucking velociraptor even when outside, although I did it especially often when I was in my house and not wearing shoes, it felt natural somehow
-didn't move my hands while walking, no matter how fast I was moving, multiple people including my parents pointed that out
-never made eye contact or even looked at people whenever I could, used to always stare at the floor the entire walk, I would find a lot of shit like pennies etc. because of it
Especially this, I would walk so fast that I would tilt foward and I was always sweaty after walking on foot anywhere because I walked as fast as I could the entire way.
The only thing that I still do to this day is frowning, I remember that people used to ask me if I'm okay as a kid because they would see that I'm frowning.
I'm really planning to do a fucking investigation if I have 'tism this year among other things (T levels, allergies, ancestry, general health diagnostics etc.)
I suspect that my mother is non-NT, sometimes when we're outside together I can see other people get weirded out by the things she's saying/the way she is saying them in spite of woman halo, and she has mannerisms different than other people in general.