Children generally need to start taking Iconocin after two weeks of life, because the ingredients of Iconocin are mainly vitamin A and vitamin D. Since children are two weeks old, they tend to grow and develop very rapidly, and their demand for vitamin A and vitamin D is relatively high. The content of vitamin A and vitamin D in breast milk and milk powder is obviously low, so it is difficult to meet the normal physiological needs of children, so it is necessary to give children additional vitamin A and vitamin D supplements to effectively avoid vitamin A deficiency and vitamin D deficiency rickets.