Quite frankly your granddaughter's pediatrician sounds like a moron. The poor kiddy probably has a problem now because she was discouraged earlier. There is NOTHING wrong with a child (in effect) self toilet training early. Early toilet training is only a problem when the child is "forced" too young. My 2nd youngest niece decide she was interested in the potty almost as soon as she could walk. She was allowed to pursue this interest (no pressure at all) and as a result was out of diapers (except for overnight) by the time she was 20 months.