There is no specific age limit for zinc and calcium supplementation for children, but it is generally appropriate to supplement about one hour after eating dinner. If you need to supplement at the same time, it is recommended to supplement zinc first and then supplement calcium at an interval of at least half an hour to avoid mutual rejection, which may affect absorption and utilization. Zinc and calcium play an important role in the growth and development of children. Zinc can promote intellectual development, strengthen the body’s resistance and improve appetite, etc. A lack of zinc can lead to decreased immunity, mental retardation, short stature and even dwarfism; calcium can increase bone density and promote bone development, etc. A lack of calcium can cause bones to become soft or osteoporosis, etc. If you take food to supplement zinc and calcium, you can take three meals a day. If you take zinc and calcium supplements, it is recommended to take them between one hour after dinner and bedtime, as the digestion of food facilitates absorption and further improves absorption and utilization after entering sleep. The blood calcium level is generally lower at night, so it is suitable for supplementation before bedtime. The usual diet should pay attention to coarse and fine, avoid long-term consumption of refined food, eat more food rich in zinc and calcium, such as animal liver, oysters, nori, shrimp, kelp, milk, soy products, eggs and other foods, it is recommended to go to the hospital regularly for trace element determination.