At what age do you start disciplining a child?

My son is 18 months old and although we've always done the "No, don't touch" and remove him from the situation thing, I am wondering when we should start using the "naughty chair" approach. When he's tottally out of controll (not very often) I have put him in his room and shut the... show more My son is 18 months old and although we've always done the "No, don't touch" and remove him from the situation thing, I am wondering when we should start using the "naughty chair" approach. When he's tottally out of controll (not very often) I have put him in his room and shut the door, but he can open his door, so it's not long before he comes out.
20 answers 20