Multivitamins for children who attend daycare and are often sick have not been proven to be effective. It is recommended to focus on non-pharmacological measures such as ensuring your child consumes plenty of fruits and vegetables, gets enough sleep, and manages stress. If your child is prone to colds, using a saline solution for sinus hygiene can help prevent mucus buildup. Unless diagnosed with a deficiency, multivitamins may not provide any benefit. Iron deficiencies are rare due to the availability of iron in various foods. Consult a healthcare provider for a prescription if iron supplementation is deemed necessary after a medical evaluation and blood test.