In general vitamin AD drops are more effective for babies because the main components of cod liver oil do not have an obvious active ingredient of vitamin A and vitamin D. Therefore, vitamin AD drops are more effective for babies. Vitamin AD drops are more suitable for children as they can take both oral vitamin A and vitamin D supplements at the same time, plus they taste better and are more compliant. Especially for bone development, such as the prevention of rickets, osteoporosis or osteochondritis have a very good and significant effect, for children’s physiological needs of vitamin A also have a certain supplementation effect, so AD drops are better.