Bed wetting is generally a normal part of child's development. Normally before the age of 5 it is not concern. If it is continues then treat the problem with patience and understanding. If a small child pass urine during night on bed after the age of 5 at least twice a week for three months then it is considered as disease called Bed wetting or Nocturnal enuresis. In ayurveda, it is known as Shayyamutra.