Bed-wetting is a condition where the child urinates constantly or periodically during sleep. In order to diagnose this condition, it is necessary to be sure that the child already has control over their bladder, so a diagnosis can only be made after the child is 5 years old. However, it is important to be aware that bed-wetting itself can be a symptom of another condition, so other possible conditions should be ruled out in the diagnosis process.