The amount of urine your baby produces varies by age. The amount of urine an infant produces each day can fluctuate depending on the amount of water consumed and the temperature. If the amount of urine per day is less than 250ml per square meter of body surface area, it is less urine, which is roughly equivalent to less than 400ml per day for school-age children, less than 300ml for preschoolers, and less than 200ml for infants and toddlers. the main reasons for infants to urinate less include the following. 1, inadequate feeding: baby feeding breast milk is relatively insufficient or insufficient water intake, easy to cause dehydration of the body, so that urine concentration, resulting in less urine. At this time, the baby needs to be supplemented with water in a timely manner, breast-fed babies, the mother should also pay attention to the intake of water, the infant urine less will slowly improve. 2, due to the imperfect development of the baby’s digestive system: digestive tract diseases, especially gastroenteritis, can easily cause the baby to have persistent high fever, diarrhea, vomiting, abdominal pain, a lot of dehydration and other phenomena, it is easy to have the symptoms of dehydration, thus reducing the baby’s urine. At this time, you need to take your baby to the hospital in time to avoid other complications that may affect your baby’s healthy growth. 3, if accompanied by swelling, hypertension, may be due to kidney disease: need to promptly go to the hospital for timely treatment. In short, the mother should let the baby usually drink more water, and pay close attention to the changes in temperature environment, not too hot too dry, when the baby appears to urinate less, should carefully observe the baby has no other symptoms appear.