baby flapping one arm

Kayley • 24 years old, I have a little boy who’s 4 and I’m TTC my second baby!! 👶🏻
My son is 4 months old, today he woke up and has been flapping his right arm randomly throughout the day, he only does it with the one arm. Is this normal? I'm kind of worrying. He also does scratching movements with his right hand on any surface. 

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