IME none of my children showed themselves to be ready for it. I have always initiated the PT and I have always found that the first day or two you feel you are wasting your time and then they suddenly seem to get the idea. I think it is not that they aren't ready but that they haven't had to think about when they wee or poo when they are in nappies and then suddenly you are expecting them to think about it and anticipate it, and that takes a couple of days to think about.