Four-month-old children do not urinate at night, there are two kinds of normal or abnormal, need to be combined with the state of the child to determine the specific analysis is as follows: 1. Normal: If the child does not urinate at night, but wakes up with normal urination, and the child does not have edema, is in good spirits, plays and sleeps normally, and does not show signs of discomfort, this is usually normal, and it is considered that it may be due to the low amount of urine caused by drinking too little milk and water, and the child can be given an appropriate increase in the amount of feeding. 2. Abnormal: If the child does not urinate at night and seldom urinate during the day, this is usually abnormal, which may be caused by kidney disease, such as nephritis, renal failure and other causes of the child’s night urination, or even no urine. It is recommended to seek medical treatment in time.