id have to agree with the drinking more formula when sick, even at my age when i get sick.. like just last week i had a virus in my intestines and was not alound to eat. i drank all liquids and my milk. my dietican told me it was also a good idea to have dialuted jusic. applesauce and or sherbert. sherbert is a fuit falvor low in phe icecream. also is called sorbeet! hope this helps! try to avoide apple juice and orange juice when sick as it has an high acid content wich hurts a sore tummy. my little tick for ppl my age or myslef is hot apple cider.. cures my tummy aches all teh time!!!! i hate ginger ale so its a blessing!!!