Although we emphasize that children must take calcium and vitamin D supplements during breastfeeding, it does not mean that they do not need to take them at other times. Our diet is based on grains, vegetables and meat, with less dairy products consumed, and the winter sunlight in northern areas is not sufficient, plus children grow more rapidly and often have symptoms, such as growing pains often seen in childhood. Therefore, during childhood, especially during the period of rapid growth and development, such as puberty, calcium and vitamin D supplementation is still needed. The most convenient and effective way to supplement calcium and vitamin D is to insist on drinking milk, which is high in calcium and mostly fortified with vitamin D. As children can already absorb calcium from milk well, if children can insist on at least 2 bags (400 ml) of milk daily, calcium supplementation is basically guaranteed. The calcium supplementation is basically guaranteed. If the growth rate is too fast or there are obvious symptoms of pain in the lower limbs, you should go to the hospital or health care department in time to find out the cause, and under the guidance of the doctor, correctly supplement calcium and vitamin D to ensure the needs of children’s growth and development.