Breastfeeding requires calcium supplementation. If exclusive breastfeeding is practiced, since toddlers or newborns have a higher demand for calcium during this period, which is the first developmental peak of life, i.e., the period of rapid growth, supplementation through breastmilk alone may not be sufficient, especially since the longer the breastmilk is breastfed, the lower the calcium content will be, and it may be difficult to satisfy the calcium demand of newborns or toddlers. It is recommended that calcium should be supplemented as early as possible, along with vitamin D to ensure that there is no deficiency of the raw material during the rapid growth period. There are two rapid growth periods in life, the newborn or toddler period and puberty, both of which are characterized by faster growth and higher elemental needs, including calcium and vitamin D. The calcium and vitamin D supplements can also be taken during the rapid growth period to ensure that good growth is achieved. In order to ensure that good growth and development can be achieved, the raw materials need to be sufficient, calcium and vitamin D need to be adequate, and breastfeeding alone may still be insufficient in terms of calcium supplementation.