Dr. Greene's Answer
Infant Potty Training, or Elimination Communication, or the Diaper Free Movement, is a an increasingly popular potty training alternative. Here, parents learn to recognize clues that their baby is about to “go” and provide them with a receptacle just in time.
Several readers of Raising Baby Green have reported that they started doing this when they introduced solid foods and greatly reduced the number of diapers used—and got their kids out of diapers entirely not long after they started walking.
This takes a lot of work, but it can be good for the environment and for the pocketbook.