In most cases, bedwetting in children at the age of 4 years is a physiological phenomenon because the neurological development of the child’s brain is not fully mature before the age of 5 years, causing physiological bedwetting in children, which will gradually decrease with age. If a child is older than 5 years old and still wets the bed, it should be considered a pathological factor, such as congenital spina bifida, urinary tract infection and urolithiasis, etc. Therefore, most bedwetting is normal when a child is 4 years old, and it is only necessary to drink less and hydrate before going to bed.