My son's nursery got in touch to tell me that he has been pushing his friends. They said this behaviour is new, it started just last week. He is 2.5 years old. There is no physical violence at home, I give him loads of love and hugs and kisses. He is an only child. Is this normal behaviour and should I be worried? I've tried telling him not to push other people and to be kind, but apart from that I have no idea what else I can do 🤷♀️