If a blood pressure is felt to be low, evaluate the infant for shock. If the infant is hypotensive without shock (oxygenating, not acidotic, normal urine output, good perfusion, and normal capillary refill time), aggressive treatment is usually not necessary, regardless of the BP. Close observation and reevaluation of the infant is necessary. If the infant is hypotensive and showing clinical signs of shock (acidotic, not oxygenating, decreased urine output, prolonged capillary refill time, and poor peripheral perfusion), the infant is probably not perfusing and has a BP that needs to be treated. Early aggressive management of shock is necessary.