Infants and children can supplement calcium by consuming lacto-calcium, which is generally recommended to be taken about an hour after dinner for best results. Milk calcium, also known as whey calcium, is a natural source of high quality calcium extracted directly from fresh milk, which is very rich in nutrients and has the effect of mediating the blood calcium balance in the body and increasing the immunity of the body. For the three time periods of morning, noon and night, the human gastrointestinal absorption capacity is not the same, in the evening due to less activity, gastrointestinal peristalsis slowed down, lactal calcium in the gastrointestinal stay relatively longer, can promote the absorption of calcium elements. Therefore, the effect of calcium supplementation in the morning, midday and evening is enhanced in turn, and the best effect is achieved by consuming lacto-calcium about one hour after dinner. For infants and children who consume lacto-calcium for calcium supplementation, it is recommended to get more sunlight during the day to promote calcium absorption, pay attention to proper exercise, do more outdoor activities, avoid drinking beverages, coffee, etc., and eat a reasonable and healthy diet to achieve a balanced nutrition.