Generally, infant D3 is taken orally in the morning, so the absorption effect is better. In this regard, we generally say that after the baby gets up, we will carry out some related feeding. After feeding, we will give D3 orally. Later, we will carry out outdoor activities, and then more sun exposure. These can promote the absorption of D3. Therefore, in this regard, we suggest to carry out it in the morning. One is that it is conducive to absorption. In addition, activities can also promote the absorption of these D3s, so we also need to assist in the arrangement of complementary foods, so that we can achieve synergy. In addition, with balanced nutrition, meat and vegetables, more activities and more sun exposure, it is beneficial to promote these absorption.