Children achieve bladder control at different ages.
By the age of 5 years, most children no longer urinate in their sleep. Bed-wetting up to the age of 5 is not unusual, even though it may be frustrating to parents. Treating a child for bed-wetting before the age of 5 is not necessary and may even be harmful to the child. The exact cause of most bed-wetting is not known. Many factors are involved.