My little boy is 7 weeks tomorrow and I put him on the potty this morning and we got our first pee in it! I'm so impressed It's based on the fact that babies pee when you take their nappies off anyway so if you allow them to go to the toilet and give them a sound and or sign to associate with it like 'sss' they will learn to go when you make that sound. Also (and an important point) it doesn't have to be done full time and can be done with or without nappies. A combination of temperature change and holding them in a squat position can make them go but obviously no pressure if they don't. It's also referred to as baby lead potty training. Please don't misunderstand me, there is no pressure on him and I'm not trying to make him grow up too quickly as I believe this is a practice that is carried out succesfully in many places all over the world. Plus if I can give him the opportunity to sit in clean dry underwear sooner, I think it's a good thing! Anyone have any experience with it?