What is the cause of yellow urine in infants? The most common causes of yellow urine in infants are as follows: 1. reduced water intake, low water intake leads to an increase in the concentration of urobilinogen in the urine and the color deepens, resulting in yellow urine. 2. relatively more sweating leads to a decrease in urine and an increase in the concentration of urobilinogen in the urine causes yellow urine. 3. liver function and pancreatic function are affected by lesions, which can lead to yellow urine. 4. the influence of drugs, the color of drugs is yellow, after the kidneys are excreted, resulting in yellow urine. 5. After the kidney excretion, resulting in yellow color of urine. 5, urine contains blood, urine color will change yellowish when there is a small amount of blood in urine of patients. If it is because of reduced water consumption, the color of urine can soon be turned to normal by drinking water, which is usually normal. If the liver and kidney function is abnormal, pay attention to do the corresponding examination. If it is caused by taking medicine, there will not be much problem if the color of urine turns to normal after stopping the medicine.