Holding his urine for longer periods is ONE of the signs but it's not the only one.
Yes, you can train him (or rather you) at this young age. Keep an eye on him and see if you can figure out a pattern to when he pees and poops. Start taking him to the potty at those times or at regular intervals all day long. Once he accidently goes in the potty, make a big deal out of it. He won't appreciate stickers or rewards but he'll like likes of smiles and happy talk. Until he is old enough to take over on his own, YOU will have to do the work... take him at the right time or on a set schedule, work his clothes, keep him there until he goes or for a certain length of time, etc. Once he is old enough to take over, you can start teaching him to recoginze the "I've got to go" feeling and how to stop playing long enough to go when he needs to instead of when you want him to.
at 11:43 AM on Nov. 13, 2008