It is better for babies who are 20 days old to take vitamin D3 than cod liver oil. The difference is that cod liver oil contains a variety of ingredients, including vitamin A and vitamin B. The baby can take it after 15 days of birth, usually one pill a day, and occasionally one pill every few days. At the same time, parents should take their children out to enjoy the sun. D3 and cod liver oil can promote tooth growth and bone calcification in babies. If a baby is deficient in calcium, his baby teeth will erupt too late or he may develop rickets. Ma Bao must remember to supplement these nutrients to the baby in time. If Ma Bao wants to give her baby d3 and cod liver oil at the same time, she must combine the two amounts and never overdose. Both d3 and cod liver oil can promote the baby's calcium absorption, so Ma Bao can choose which one to take according to actual needs, but be careful not to overdose.

The main components of cod liver oil are vitamin A and vitamin d. Vitamin A is used to prevent and treat night blindness and plays an important role in maintaining normal vision development and improving immune function. Vitamin D can promote the absorption of calcium and prevent rickets and tetany in children. Vitamin D3 is the nutrient with the highest absorption and utilization rate among the vitamin D family. Its function is to promote the absorption of calcium and prevent rickets and convulsions in children.

Vitamin D3 can promote the absorption of calcium in the intestine, promote bone mineralization, promote the formation of bone trabeculae, and enhance bone strength. It is commonly used clinically to treat and prevent vitamin D3 deficiency diseases caused by various causes, such as osteoporosis, rickets, etc. Cod liver oil contains both vitamin D and vitamin A. In addition to supplementing vitamin D, the vitamin A in cod liver oil also has the function of protecting skin and vision. However, vitamin A is easy to accumulate and become toxic, causing damage to liver function.

Vitamin D is the main component of vitamin d3 and cod liver oil, but vitamin A is added to cod liver oil. Vitamin A can very well prevent night blindness in babies. Especially when the baby is young, the vitamin A content in food is relatively low. Appropriate vitamin A supplementation can effectively prevent some symptoms caused by vitamin A deficiency. Therefore, cod liver oil should be the first choice for babies under six months old. After six months, the baby will be introduced to complementary foods. Vitamin A in food is enough to maintain your child's physiological needs, so you can choose simple vitamin D.