Has anyone heard of this....? My friends 4 year old does it a lot...where he flexes and stretches out his fingers. A different friend of mine said this is a red flag for Autism. He also is very hard to understand, isn't potty trained, constantly clumsy(falls a lot), flaps his hands when upset.... I worry now that that may be what's going on. He is pretty sociable so I don't know.
I would think not being potty trained and not being able to talk properly is a red flag for something, but I'm not sure if it's Autism.