Trace elements for children mainly include calcium, iron, zinc, copper, magnesium, lead and other elements, among which three elements are very important for children’s growth and development, such as calcium, iron and zinc. Calcium is one of the essential elements for children’s bone development and growth and development. If there is a deficiency of calcium among the trace elements, children will have sleep disturbances and growing pains. Therefore, timely examination and proper supplementation are beneficial to the child’s growth. In case of zinc deficiency, children may have a loss of appetite and become picky eaters. In order to ensure a normal diet, zinc supplementation should be given appropriately, commonly used are zinc gluconate oral solution, etc. Iron deficiency can cause iron deficiency anemia in children, so if iron deficiency is present during the examination, iron supplements should be given.