Children had better supplement calcium in spring and summer. Because the temperature rises in spring and summer and outdoor activities increase, the baby can increase the time of sunlight exposure and promote the absorption of calcium, so calcium supplementation is the best in these two seasons. It is necessary to ensure outdoor activities for about two hours every day, and at the same time, pay attention to adding complementary foods or eating foods rich in calcium, such as shrimp skin, bone soup and meat. Physical exercise, such as climbing mountains and jumping, can promote bone development.