Babies urinate less and yellow urine is usually related to physiological factors such as low water intake and pathological factors in the kidney. 1. Physiological factors: if you drink less water, not enough into the volume, can lead to the child urine less, urine concentration, urine color yellow. In addition, if the baby consumes too much protein food may also lead to yellow urine. 2. Pathological factors: kidney disease can also lead to the baby urine yellow, such as renal dysfunction, urine filtration function decreases will be prone to this situation, mostly because of the child congenital renal anomalies or separation of the renal pelvis and so on. If your baby’s urinary symptoms are serious, or have not been improved, it is recommended to go to the hospital in time for treatment.