Ds sometimes bites and pinches when he's playing and this is getting worse. He's also started hitting out if I take something away from him or stop him from doing something and I feel it's starting to get a bit out of hand. I used to do time out and say no to whatever it is he's doing and this used to work. But now he either laughs at me or pulls a silly face and says no back at me and then bites or pinches again. Do you think naughty step could work at this age. I'm sure he would understand the concept as he now seems to understand much of what I say to him. Is there anything else I could try?