hope your baby feels better soon!!
beth gave you lots of great info! do a search on premium foods, to feed.. you will find a ton of info!
and like she said no corn, wheat, or by-products!!
we feed a variety to our girls... we feed a RAW diet (nature's variety canned & RAW, ziwi peak canned and dry, the honest kitchen) and we leave a dry kibble down all day.. so they can eat if they get hungry!
good luck!! get well soon baby boy!