Book excerpt: It's one of life's first rites of passage- somewhere around the age of 26 months, toddlers are introduced to the potty. Some take to it right away; some need a little more time or encouragement. Some, however, seem to have no interest in training at all or, indeed, seem bound and determined to resist it. And no matter how often a neighbour or relative tells you "No one ever packs diapers when they go way to college," you're beginning to think your child might be destined to enter the Guinness Book of Records for longest continuous use of Pampers and Pull-Ups. In The Pocket Idiot's Guide to Potty Training Problems, Alison D. Schonwald, also known as "The Poop Doctor" of Boston's Children's Hospital, addresses the needs of parents and their reluctant toddlers in a warm, reassuring manner that will calm nerves and ease tension all around.