When can we start actual disciplining the child?

Start from the time when baby begins to understand things. I think it should be more about putting a thing across than a strict discipling a child. I believe discipling is a very strong word and I would like to replace it with 'guidance'. We should start guiding our children when they begin understanding things. And always have a dialogue with them when you have to tell them it is not right or this is wrong rather than commanding them or ordering them in the name of discipline. Guide them through to become a disciplined human being. And the process will be smooth if you will give your child freedom to express himself at all stages of life.