K.E.
Not too early - my son started using the potty at 5, yes five, months. He went on it several times a day from 6 months to about 13 months then had a "potty strike". He's back on it but not as regularly as when he didn't have that toddler independance! My doctor said between 18-24 months is the best time to start. They are old enough to understand yet young enough to wean off of diapers. Once they get past a certain point, they can be very stubborn in their ways! I agree with pp's about not pushing it on them. We tried to "train" at 13 months (before then we just gave him potty-tunities). I think I pushed a bit more then I should've and that's why it backfired and he went on his strike. My doc also said that once you decide to "train" you need to be totally invested in it. She recommends going commando for about a week. When you go out, use cloth trainers and offer lots of potty breaks. If you put a diaper on at any point, she says you've sabotaged the mission. HTH's!