Children supplement calcium, zinc and iron specifically can be supplemented through food supplementation, drug supplementation and other methods. 1. Food supplementation. Calcium can be supplemented by eating calcium-rich foods such as meat and milk in moderation; iron can be supplemented by eating iron-rich foods such as lean meat and animal liver in moderation; zinc can be supplemented by eating zinc-rich foods such as shellfish. 2. Drug supplementation. If your child’s calcium, zinc and iron levels are too low, you need to take medication. Calcium can be supplemented by taking calcium gluconate, together with vitamin D to assist the absorption of calcium; iron can be supplemented by oral ferrous sulfate oral solution to carry on the treatment; zinc can be supplemented by zinc gluconate oral solution to carry on the treatment. Food supplements should be taken in moderation to avoid malnutrition caused by a single diet. If medication is needed, it should be taken under the guidance of a doctor to avoid blind use of medication. When a child has a micronutrient deficiency, it is important to seek medical attention and take reasonable supplements under the guidance of a doctor.