Is arm flapping always a sign of autism?

NO, it's not always a sign. Many children flam their hands and arms and are neurotypical. By itself, hand or arm flapping is not a red flag. If you have concerns it is always good to talk to your pediatrician though.

Moms Expertise
    It could also just be startle reflex and then they realize moving their arms is a new cool thing they can do!
    About Melissa
    Birth: December 31
    On since: Mar 3, 2014
    I am a single mom of two fantastic kiddos that I love to pieces. Currently in school working towards my teaching degree. You can find me most days on when I am not here chit chatting! :)