Vitamin D helps to facilitate normal immune system function in children and adults. Vitamin D deficiency can occur if you don't consume the recommended levels of the vitamin over time, you have limited exposure to the sun, or you have difficulty absorbing vitamin d from foods. Vitamin d3 benefits include reducing the risk of developing bone abnormalities and increased exposure to certain diseases. Providing 400 units daily of Infant vitamin d drops is critical for normal growth and development of teeth and bones. In a recent study by the Journal of the American Medical Association and the American Academy of Pediatrics, recommended 400 units of vitamin D3 taken daily, which would be beneficial to newborns and babies up to 12 months. Recent studies revealed that reduced levels of vitamin d have been proven to result in severe asthma in children.