This is my first post so bare with me.
My four year old (nearly 5) son has started pulling hair, hitting and poking other kids at nursery for no apparent reason. He will literally go up and pull hair etc with no prior warning and show no signs of remorse if / when there’s a reaction. Is this normal behaviour? He is quite shy and struggles to involve himself in a group activity or approach a person or situation. Is this his way of doing this or has he got no empathy? I’ve tried rewards charts, explaining why we shouldn’t behave like that, explaining feelings and emotions, telling him off but he still does it, almost like an instinctive thing. He doesn’t do it anywhere other than at nursery