Symptoms of poor renal function in infants include: 1, changes in urine volume: the average daily urine volume of a normal person is about 1500ml, whether the urine volume becomes more or less, may be the manifestation of kidney disease; 2, changes in urinary characteristics: normal urine is transparent and light yellow, such as changes in the color of the urine or more foam in the urine, must be tested for routine urinalysis; 3, edema: puffy eyelids in the morning or swelling of the lower extremities; 4, nausea, vomiting and other gastrointestinal symptoms; 5, patients with end-stage renal disease, due to the body’s urea can not be excreted through the urine, and more through the skin, so itching, peripheral nerves, and other lesions.