It depends on what you mean by potty training - how much do you expect your child to do? Do you expect him to stop playing, walk to the bathroom, pull down his pants, use the potty, pull up his pants, wash his hands, and then go back to playing? Or do you expect to take him at regular times, work his clothes for him, do whatever it takes to keep him on the potty until he goes or until a time limit is reached, wash his hands for him, and then turn him loose until the next potty time? Both (and everything in between) can be considered potty training.
To do the first one, you need to wait until the is ready. Undressing is just one sign of many.
To do the second, you can start anytime you want - 1 month old, 12 months old, older.
All the potties and seat adaptors work fine. Pick one that you like, that you have the room for, or that your son picks out for himself.
at 5:26 PM on Oct. 13, 2008