Anyone have babies that constantly flap their arms?

Any of you moms have babies at 9 months constantly flap their hands and outgrow it? This is a major concern for me. Pediatrician didn’t really say much but they can grow out of it sometimes , i have thought poss autism even tho they can’t diagnose this early I just feel like she has some traits already

Do they watch Ms. Rachel. I seen her doing it on a few videos.

My nephew did until he was… 2ish? He had a lot of tendencies that made us wonder about being autistic but he seems to have out grown it

What do you mean , by flap their arms