my son,who is now 8 yrs old, had the dreaded rota virus and was so sick around that same age. he was hospitalized for 1 night just to get dehydration under control. basically breastmilk, breastmilk, and more... breastmilk! if you arent breastfeeding anymore, homemade chicken soup without noodles, mostly thick, gelatinous broth if possible. maybe a chewable acidophilus/bifidus supplement. plain yogurt if he tollerates dairy. best of luck!