Newborns need to take vitamin A and vitamin D supplements because vitamin A promotes the development of baby’s bones, teeth and hair, maintains normal visual function, and also repairs damaged tissues, leaving baby’s skin smooth and soft, and vitamin A has anti-infective properties, reducing the chances of baby suffering from respiratory and digestive system infections. Vitamin D has an important role in the formation of baby’s bones, promoting the absorption of calcium and phosphorus, helping to maintain blood calcium and phosphorus at normal levels, promoting bone calcification, osteoblast function, bone-like tissue maturation, and also reducing the excretion of calcium in the kidneys. Once deficient, the baby has the possibility of developing pediatric rickets. Vitamin D is less in the natural foods commonly eaten, resulting in lower levels of the vitamin in breast milk, and babies are mainly breastfed, so extra vitamin D supplements are needed.