DS is 15 months. He is lovely most of the time but seems to be so aggressive sometimes. He hits, kicks, throws things etc. He is very big for his age and, although it sounds stupid, he can sometimes really hurt. He also smacks 3 year old dd.
I tell him "no" but he just seems to find it funny.
I'm hoping its just a very short phase, but is there anything else I should be doing to stop him ?