Babies do not have urine in one night, it may be insufficient food, sweating more, severe vomiting, diarrhea, fever, kidney failure and so on. 1. Insufficient food, if the child’s breastfeeding during the day is small, and did not add supplemental food, the body is in a state of dehydration, there is no urine. 2. Sweating more, hot weather or wrapped too tightly, the child sweats a lot, water loss is serious, there will also be no urine. 3. Vomiting, if the child has acute gastroenteritis, encephalitis, etc., may cause repeated vomiting, gastric fluid loss resulting in dehydration. 4. Diarrhea. Acute enteritis caused by eating unclean food may result in severe diarrhea, massive water loss and absence of urine. 5. Fever, if the child develops a persistent high fever due to infection, water is lost through the skin and there is also dehydration and anuria. 6. Kidney failure, may be due to hemorrhagic shock, infection, allergies, isotonic blood transfusion, etc., resulting in renal failure, anuria. Infants do not urinate at night, pay attention to timely hydration of the child, take the child to the hospital. There may be other reasons why the infant did not urinate at night, and the patient needs to consult the doctor for timely examination and early treatment.