My eldest (3.5 boy) started in a new nursery back in April, and after being pretty quiet for the first few weeks, he has really started settling there and making friends in the past couple of months which is great.
One issue we are having though is that in that same time, he has started developing some behaviours that are quite aggressive and we are not sure how to handle it properly.
He always was energetic and loud, but what used to be play fight with his little sister has now turned into pinning her down to make her upset.
Instead of just pushing her if they argue, he has punched her on a couple of occasions (both are obviously not ok, but the intent is much more violent with the punch IMO and there is absolutely nothing at home that would 'teach him' what a punch even is).
There was an incident today at nursery, it's the first time he behaved like this with a child who isn't his sister (that we know of). When I talked to him tonight he seemed to understand why he had been told off at nursery, and why I was not happy with him. He also said others do the same to him at nursery (e.g. pinning him down on the floor) and that he thinks it's funny - to be taken with a pinch of salt obviously given his age.
I know part of it is that he doesn't know when to stop when he is playing. So far we have focused on "when someone say no/stop, you stop and step away", and the importance of being kind etc.
It's hard to find a time when he is receptive to it though, he will often start making silly faces and try to divert the conversation.
Anything else we could do (books maybe?).
I have already messaged the nursery as well to understand better what happened today. Obviously I'm not there so I can't be 100% sure but to us it's quite obvious that he learned those behaviours there.