Share 'Spitting and hitting...'

My older ds, L, is just 4 - i have a 1 year old too. L has been doing this a while now - he kinda of razz spits at me a lot - his dad and baby too. I've tried to look for triggers but often there is none - like i was cuddled up with him yesterday watching a film and he just turned round and did it for no apparent reason. (obviously he has a reason for it but its just not an obvious trigger whi...