Many toddlers and children are released home with relatively low hemoglobin levels following cardiac surgery, and with no careful follow up, at an age at which anemia is common. At this age, breast milk and its substitute do not provide enough iron, and parents are not adherent enough to iron supplements. Due to these facts, there is high importance, especially in children suffering from heart defects, for close follow up on their hemoglobin levels. Studies following hemoglobin trend post cardiac surgery were never done with children.