Childhood nephrotic syndrome occurs most commonly between the ages of one and a half to eight, although it can occur at any age. It is marked by high levels of protein in the urine, low levels of protein in the blood, and swelling due to water and salt build up. Other symptoms include less frequent urination, weight gain caused by fluid build up, and tiredness. Childhood nephrotic syndrome is not a disease in itself but rather an indication of a disease that may be damaging the blood-filtering units in the kidneys. Treatment options include prednisone or other drug therapy, a low salt diet, and homoeopathy.