Researchers have found that those children who have begun potty training at 18
months are generally not fully trained until 4. Whereas those kids who have
begun training at 2 years are generally fully trained till 3 years. Many kids
may not be fully trained until 4 years. You can wait for a few more months and
then consult a doctor. But there is no real deadline; different kids may take
different time. Most kids are potty trained by 5 or 6 years. If it worries you,
then consult a paediatrician.