My MIL swears she had all hers trained by 18 mos. (3 boys, 3 girls), so it can be done. Boys are a lot harder and take longer than girls. I would definitely try big boy undies during the day. He will get the message when he's playing in soggy drawers. He probably isn't ready for night time though but when he is, use plastic sheets to keep the mattress dry and make sure he doesn't drink after dinner and goes potty before bed. If he is starting preschool in the fall, he will have to be trained by then so you can use that as an incentive also. Good luck!
My ex's mother swears that all 3 of hers were PT'd by time they were 2. Also, that she always fed them well. Yet, I have seen pics of the kids with tea in their bottles. Her own husband says that the boys were not PT'd by time they were 3.
