We report four patients with pseudohypoaldosteronism, aged 5 months to 5 years. All patients had hypercalciuria and three had nephrocalcinosis. Two patients with nephrocalcinosis were treated with indomethacin. Polydipsia decreased and appetite and weight gain improved within 14 days of therapy. Hypercalciuria, polyuria, and creatinine clearance decreased 30% to 50% and urinary prostaglandin E2 levels decreased fourfold to eightfold.