Very small red spots in my 5 months baby's chest and back. is this a food allergy?

Baby rashes frequent: Babies get lots of rashes and often we don't find out why. If the rash occurs every time the baby eats a certain food, it could be a food allergy. If not, it could be heat rash, a viral infection, sensitivity to detergent, etc-the list is long. Most rashes that babies get go away the next few days and aren't worth worrying about. If baby gets a fever or the rash gets worse, then see your doctor.

Hard to say: With the limited information, it is hard to say, but it is unlikely. There are many causes or rashes in infants and food allergy is uncommon unless there are other associated symptoms or a specific cause and effect relationship. Either way, i would recommend evaluation by you pediatrician and if the concern persists, see an allergist or a dermatologist.

Maybe: If you recently added a new food to his or her diet then i would be suspicious of a food allergy. It may be necessary to remove a suspicious food, wait for the rash to clear and consider re-adding the food depending on what your doctor says. Your doctor can make a better diagnosis of he or she sees the rash while it is present.