2 months baby breastfeeding a night diaper is dry, may be diapers absorbent, baby eating less milk, a lot of sweating or urinary tract obstruction and so on caused by. 1. diapers absorbent: now the quality of diapers are better, in order to make the baby comfortable, generally absorbent strong, the baby after urination in time to be absorbed water, so will feel the surface dry. 2. baby eating less milk: if the baby at bedtime to eat less milk, general urination will be less, as long as the milk is normal, no other symptoms of discomfort, is a physiological phenomenon. 3. a lot of sweating: may be due to the temperature is too high, or give the baby cover too much, resulting in the baby sweating more, water through the way of sweating out, there will be no urine phenomenon. 4. Urinary tract obstruction: it may be caused by the narrowing of the baby’s urethra or neurogenic bladder, etc., the urine is not able to be discharged in a timely manner, thus the phenomenon of anuria. If the baby appears uncomfortable symptoms, it may be caused by disease, must promptly go to the hospital to identify the cause of targeted treatment.