DS2(7, ASD) is making a lot of progress atm. He has always been a calm placid child - willing to go with the flow, with no rigid routines. This seems to be changing as he is progressing: he is getting very angry when things don't go his way and is sometimes expressing this in a physical way - most commonly by grabbing me and pushing his face really hard into whatever part of my body he can reach, but occasionally by pinching or hitting. I can cope with this - I just say 'You're very angry' and hold him off. But today he lashed out at DS1, who was very shocked. I'm worried in case it happens at school - I know they're pushing him more academically now and he does sometimes try to pinch them when he doesn't want to do stuff.
I know this is a silly question - but what is the best way of dealing with this? I want us to have a consistent approach - something that we can all do, including DS1, and that I can pass on to school. He doesn't have much language but can verbalise 'sad' and 'angry'. He understands simple sentences but nothing too complex. Do I say ' No hurting' or 'No hitting' ? Is it a good idea to verbalise his anger for him? Should I ignore, look angry?
Just to add - I'm actually quite pleased he's being like this - I see it as a natural part of his development. He really has been almost unnaturally passive up to now. But he obviously can't hurt people.