My sister has three boys... a 4 years old a 3 year old and the youngest is about to turn 2(shes been buying diapers for 4 years ).... believe it or not I have alot of experience with babys... shes is still trying to potty train the 3 year old... waht she does is she always asks him if he has to go and when he wakes up from naps and stuff and when he goes to bed she puts him on the toilet... she said "you always have to be watching him."