When do you start discipline and how to do it?
DD is been quite out spoken these days though she can't express herself by language. So, she decided to scream/yell to whatever she doesn't like. I've been saying "no" in a calm tone slowly turning to more a firm voice but she doesn't seem to understand. I don't want her to turn out like kids whom the parents would have to chase after in order to get their attention. Having said that, I don't want to seem mean but I know that putting a limitation to certain things will do her good later.
For instance, she has such a bad table manner. She sits in her highchair with one or two of her legs up. I tried putting them down each time she does that, and when I do it, she would scream and hit me.
Another thing which I mentioned was the yelling and screaming to whatever she doesn't like (being seated in her highchair, not letting her to take things from the tables, etc).
Am I demanding too much if I want to start the discipline though not much could be done now... how did you do it and when would be the best time to start?