How to Potty Train Early. She has some helpful tips. If your child can pull their pants up and down or takes them off when wet, and is interested in growth activities, its never to early to start them. Best advice, never push them, always make it fun and assure them accidents are OK. Their bladder will make its own schedule :) Plus underwear is much more comfortable than diapers!
Potty Training Made Easy: Strategies that Really Work