C.D.
You cannot force a kid to train from my own experience. I talked to my pediatrician about this and have read up on this a lot, and the average girl is 3 and the average boy is 3.5 years old before they are day potty trained (night is later)- stats per my pediatrician. So, your child, being 3.5 year old boy is not behind at all. I would give it some more time and try not to force it at all or bring it up too much. You don't want him to associate negativity with going potty or it will be that much harder when you do try to encourage him. I would just ask him every once in a while if he wants to go potty on the big boy potty. If he says yes, then great. If he says no, then wait a few days. Most preschools now of days don't require that your son be potty trained, so you don't have that pressure that you have to be trained by a certain time. When he turns 4, if he hasn't shown any interest, then talk to your pediatrician about ways to encourage him. If he was 4.5 years old, then I would try to get him to try to go by enticing him with rewards if he does go. Still don't force him, let him go on his own, but just nudge him a little to make it worth his while to go. He will go eventually when he is ready. And, you probably won't deal with many accidents either since you waited.