Icosin is a combination of vitamin A and vitamin D. Generally, normal-born babies start taking this product on the 15th day after birth, and take it continuously until they are 2 to 3 years old. The main function of vitamin A is to promote vision development, and the main function of vitamin D is to promote the conversion of calcium in the body. Babies cannot get enough vitamins A and D from food when they are newborns, so it is important to start supplementation from about two weeks after birth until after 2 to 3 years of age. Vitamin A and D deficiency will affect your baby’s normal development and may result in symptoms such as rickets, abnormal vision development, and dry skin. However, for children who have already added complementary foods, it is not necessary to take medication to supplement, usually drink more milk, eat more purple cabbage, black sesame seeds and other foods that contain vitamin A and D is high enough to ensure normal growth and development. This product should be used in accordance with medical advice.