Bed-wetting manifests as a lack of control over urination during sleep. It is more common in boys, which is explained by the faster development of girls, both physically and emotionally. In young children, involuntary wetting is a physiological phenomenon. Concerns should be raised when a child reaches the age of five or has already dealt with the problem in the past, and it recurs. All kinds of developmental delays are twice as likely to coexist with wetting.