Why is China baby easy to lack vitamin AD? What harm will it do to your health if you don't supplement it?

Vitamin A is a fat-soluble vitamin. Its main function is to enhance children's resistance, make them less likely to get sick, and maintain their normal growth and vision. Therefore, vitamin A can maintain the normal state of cornea, and proper supplementation is beneficial to children's vision. Long-term lack of vitamin A can lead to visual impairment, night blindness, rough skin and low immunity. Vitamin D can mainly promote the absorption and utilization of calcium in the body, maintain blood calcium concentration and reduce calcium loss. Long-term serious lack of vitamin D will lead to calcium absorption disorder, affect bone growth and development, and prone to skeletal problems such as rickets. Therefore, these two vitamins play an important role in children's growth and development. Infants are most likely to lack vitamin AD before the age of 2, that is, early infants. Therefore, it is recommended to supplement vitamin AD from birth to 2 years old. After 2 years old, children can take more vitamin AD from food, and generally do not need to continue to supplement. However, children with unbalanced diet and insufficient intake of vitamin AD for a long time can continue to use special vitamin AD preparations for children under the guidance of doctors.