Both vitamin A and vitamin AD are vitamin supplements. From its name, we can see that vitamin A only contains vitamin A, not vitamin D, while vitamin AD preparations contain both vitamin A and vitamin D. Because of the different composition of the vitamins they contain, the role they play is also different. Vitamin A is mainly important for children’s immunity, bones, teeth, vision development, if lack of vitamin A may increase the risk of dental caries, iron deficiency anemia, can also cause visual impairment, especially for dark vision, night blindness or dry eyes. Vitamin D is to promote calcium absorption in babies and help the normal development of bones and teeth in infants and children. Insufficient intake of vitamin D may cause rickets in babies. We can supplement vitamin AD and vitamin D clinically, mainly in combination with different feeding methods to determine, some babies are formula-fed, the formula has already added a sufficient amount of vitamin A, so you can supplement vitamin D alone, some are breast-fed, if the mother’s diet does not contain enough vitamin A, then the baby is recommended to start supplementing vitamin AD, which is based on This is based on the baby’s feeding and nutritional status.