If an infant has clinical signs and symptoms of calcium deficiency, calcium supplementation with calcium acetate is certainly good, but the prerequisite is that the child is able to eat it, if not, it should be replaced. Of course only calcium supplementation is not enough, the focus should be on good vitamin D supplementation, because vitamin D is what helps infants absorb calcium from the intestine. If vitamin D is lacking, the calcium in food and calcium supplementation will not be effectively absorbed and still cannot solve the problem of calcium deficiency in children. Therefore, calcium acetate supplementation should be accompanied by vitamin D supplementation, and more calcium-rich foods should also be added to the infant’s complementary diet for a better calcium supplementation effect. You should also ensure a certain amount of time outdoors every day, because sunlight exposure can promote the conversion of vitamin D in the baby’s skin, which is beneficial to calcium absorption.