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 a manifestation of kidney disease; 2, changes in urinary characteristics: normal urine is transparent and light yellow, such as changes in the colour of the urine or more foam in the urine, must be tested for routine urinalysis; 3, oedema: puffy eyelids in the morning or double lower limbs; 4, nausea, vomiting and other gastrointestinal symptoms; 5, patients with end-stage renal disease, due to the body of the urea can not be eliminated through the urine, and more through the skin excretion, so the skin will be itchy, peripheral nerves, and other lesions.