Occasional exceptions are inevitable, after all, and won’t harm your child. Drooping eyelids, eye rubbing and fussiness could be signs that your child is tired. The longer you wait, the extra overtired and fussy your child may become — and the harder it might be for him or her to go to sleep. Vitamin C helps promote the absorption of dietary iron. You can help your child take in iron by offering foods rich in vitamin C — corresponding to citrus fruits, cantaloupe, strawberries, bell pepper, tomatoes and dark green vegetables. If you’re using ready-to-use formula, cover and refrigerate any unused formula from a freshly opened container.