hi,just wanted to reassure you that this is normal (i think anyway)my son is 2 and whenever he is cross he runs into something or smacks me its just frustration as they cant understand why they cant do these things(e.g hit the telly with the remote control!!!!)its just a phase and all you can do is try to distract him when he does it without drawing attention to it (or they tend to do it more im told)hope this helps x x