To supplement zinc, calcium and iron in children, the diet needs to be fortified with animal foods such as seafood, animal liver and meat. Vitamin C supplementation can also be done, which can help iron absorption. Children who want to supplement their diet with zinc, calcium and iron are most importantly supplemented with animal foods. These three minerals are most abundant in animal foods. Zinc comes mainly from meat products and seafood, and calcium also comes mainly from animal foods, with milk being the richest in calcium, containing more than 100 milligrams of calcium per 100 milliliters of milk, which is rich in calcium. Iron is highest in liver and animal blood products, and red meat is also very high in iron. Iron is best supplemented with foods rich in vitamin C, as vitamin C promotes iron absorption. Foods rich in vitamin C include fruits such as hawthorn, jujube, kiwi and orange. Children with mild deficiencies of zinc, calcium and iron can supplement with food. For more pronounced nutrient deficiencies, it is still necessary to consult a pediatrician who can decide on a case-by-case basis whether medication is needed.