K.M.
From what I understand, if you end up buying a separate potty, you have to retrain them on the big potty. So I would just get a seat for each toilet and let him start off on the big throne! I agree with Mother N...wait until he's older. I've also been told (by a former daycare owner who has trained hundreds of kids) that most kids just do not have the abilities to be potty trained until they are at least nearly 3 years old.