4-year-old bedwetting is a normal physiological and psychological phenomenon, 4-year-old bedwetting is also relatively common, medically known as physiological enuresis. Generally speaking, 5-6-year-old babies, at least two times a month bedwetting, greater than 6-year-old children at least once a month bedwetting, nighttime sleep is not able to control their own urination, only called enuresis. This is most likely a symptom caused by drinking more water at night and a dysfunction of the brain’s reflexes to urinate. As the bladder’s function of controlling urination is not yet fully developed, playing too tired and having bedwetting is not a pathology. As a parent is the need to call the baby up at 12 o’clock at night to urinate, try to develop the habit of regular urination. Adhere to the daily urination training. Do not drink water, eat cold drinks, watermelon, raw pears and other water-containing fruits and milk 2 hours before bedtime, drink as little water as possible, and eat a light diet. Do not let the child too excited before bedtime, is also needed to avoid the child has a nervous mood to sleep. To choose the right time to train the child not to wet the bed, so that the child to form the habit of active defecation, need to teach the child can go to the toilet, take the child to pick the appropriate toilet utensils, it should be noted that, do not force the child, because this is a gradual process, need more patience. Make it a habit to go to the toilet once before going to bed, and try to pass urine before going to bed.