A baby’s lack of urine at night may be due to physiological factors such as eating and drinking less water, sweating more, and pathological factors such as fever, diarrhea, vomiting and so on. 1. Physiological factors: if eating and drinking less water or high ambient temperatures lead to the baby sweating more, etc., may lead to the baby did not urinate at night, this is a normal physiological factors. 2. Pathological factors: some diseases may also lead to the baby did not urinate at night, such as fever, diarrhea, vomiting, etc., fever, diarrhea, vomiting may lead to the baby’s body of water and nutrient loss, which leads to a decrease in the amount of urine. The baby did not urinate at night, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.