I have a 4 yr old son. He is aggressive towards younger kids than him. He is the only child with no small cousins etc around us . Even in playareas he will hit the ones younger to him without being incited. On seeing them he will push, hit and kick. Even if strangers smile etc. he will reply on unfriendly tone saying No. Otherwise he is a normal, hyperactive but very intelligent and observant of his surroundings & people. Is it because I slap/spank him whenever he is aggressive with me. But if I do not hit or spank/slap him he pinches etc badly. He will be joining an International school this August in Singapore and I am worried as to how he will be with kids their. He is short-tempered. I am very fed-up.