Vitamin D prevents Osteoporosis when you get old. It can cure and prevent bone diseases, such as Rickets and Osteomalacia. How much vitamin D? Your baby should be given 499IU daily; this can be given to the baby in drops. Minimally recommended supplementation for baby is 200IU. The baby can be exposed to sunlight for a few minutes (4 5 minutes) each day. Black babies will need double the time