Many parents know that babies need to take cod liver oil. But why they need to take it is not very clear. In fact, when infants take cod liver oil, they are taking vitamin A and vitamin D. Because vitamin A and D deficiency or insufficiency are common among infants and young children in China, cod liver oil is a commonly used supplement for infants and a vitamin-based drug that contains mainly vitamin A and D. It is often used to prevent and treat pediatric rickets and night blindness. It is necessary for infants to take cod liver oil, but how should they take it to be more beneficial to their growth? This is indeed a problem that needs attention. First, pay attention to the origin. Cod liver oil differs in vitamin A and D content due to differences in form, origin and raw materials used, so care must be taken when adding cod liver oil to infants to avoid accidents. Second, pay attention to the time of taking. Babies begin to supplement cod liver oil after half a month of life, supplemental vitamin A and vitamin D usually need to adhere to the baby two to three years old. Third, pay attention to the dosage. Supplementation of cod liver oil must be in moderation, never too much. The calcium intake recommended by the Chinese Nutrition Society is: 0-6 months breastfed babies need 300 mg per day, 0-6 months artificially fed babies need about 400 mg; 7-12 months need about 500-600 mg per day; 1-3 years old need about 600-800 mg per day. Fourth, pay attention to calcium supplementation. Calcium and cod liver oil, it is necessary to supplement at the same time, but the two eat best when the interval of more than 30 minutes. Five, pay attention to not contain sugar. It is best for babies to eat cod liver oil without sugar, because sugar will affect the absorption of calcium, not the effect of calcium Sixth, pay attention to not continuous supplementation. The cod liver oil can not continue to supplement every day, because the baby’s daily breast milk, diet will contain a certain unit of VA, VD, basically eat two months stop half a month to eat again, so it will be better.