I'm afraid that the only answer you're going to get is "watch and see".

Autism, as I'm sure you know, just can't really be diagnosed at such a young age. It doesn't sound like this child has any other major red flags, which is good. I remember my DD hand flapped for awhile--it seemed to be something she did when she was excited, and just because she could. It was present for awhile (not sure how long...might have been a few months? I think it was right around that age though) and then just disappeared one day, never to be seen again that I can think of (she might do it a bit when excited/worked up, but I can't honestly say one way or the other).

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