Generally, normal healthy infants do not necessarily need calcium supplements, much less lactated calcium. If the nutritional status is good, the calcium in food is actually more than sufficient, and the main thing is to supplement vitamin D to help the infant take calcium from food for the body to use. If the nutritional status is good and the appetite is normal, and vitamin D is supplemented, additional calcium supplementation is generally not necessary. However, if the symptoms of vitamin D deficiency rickets are very obvious, such as restless sleep, easy awakening, pronounced occipital baldness, and very obvious rib-edge exostosis, they may be in the active stage of rickets, and then calcium supplements should be taken appropriately. Calcium supplementation does not necessarily need to be supplemented with dairy calcium. Each infant has different tastes and compliance, and some may be supplemented with calcium carbonate, calcium lactate, liquid calcium, or dairy calcium.