I am not expert, only another mom =0) But when my son was about 2 1/2 I started letting him sit on the potty. Once they "accidently" go pee in the toilet, reward them like crazy! Especially put them on the toilet if they wake up dry or have been dry for a few hours. Depends on how much you want to invest, but we did a sticker chart, and we he got to the end of a row (usually about 5 times) he got a special suprise. I will tell you that I thought he was ready several times and he really wasn't. Then for some reason, just before his 3rd birthday it seemed to "click" and he went pee in the toilet almost 100% of the time with only a few accidents,which before that it was about 50% of the time. Poop was another story...he didn't care, and I think this is the case mostly with boys. It was at the time that he started using the toilet almost all the time for pee that he one day recognozed after a bath while naked that his bottom "hurt". I told him to run real quick and go potty, and he did! From then on it was only a few accidents over the next few months and he was trained. I just make sure he goes at night before bed and he makes it all the way through. All in all, my suggestion is rewards, although until your child is developmentally ready, he may not make the connection or may not be able to control or know the sensations he is feeling in order to understand he has to go. Sorry so lengthy, hope this helps!