It is usually not normal for a two-month-old baby not to urinate at night, which may be due to insufficient fluid intake, high ambient temperature or illness. 1. two months of the baby drinking water or eating too little milk, can lead to the body to reduce the amount of urination, the performance of a night without urine. 2. High ambient temperatures can cause two-month-old babies to sweat more and lose more body fluids, which may result in no urine at all during the night. 3. Pathological conditions such as fever, vomiting or diarrhea can all lead to a decrease in urine output in two-month-old babies. (1) fever when the body’s metabolic rate increases, the consumption of water increases, the body temperature increases so that the loss of body fluids increased. (2) Vomiting or diarrhea causes a large loss of body fluids in a short period of time. General two months baby about 3 ~ 4 hours need to change diapers. Found that the baby’s urine decreased, you can first increase its fluid intake, observe whether the urine volume increased, and at the same time to observe whether the baby has other manifestations, if the urine volume continues not to increase, need to actively seek medical attention to identify the cause of the disease, and treatment.