Is this normal?

[Momof4]

The only thing I have ever noticed like that was my grandson who was about that age when he started hitting himself on his head with his hands really hard at about that age. He was never violent toward anybody else. It was frustration, stress, learning to share space with other children, a whole bunch of combined things. But also, his parents split up right about then. Have you talked to the parents to see if there are big changes at home causing the child stress and to see how they are handling it? You should come up with a plan of action together to help this child learn to self-soothe in other ways, a cuddle, a blanket, I don't know, but the parents may have suggestions. Good luck to you.