S.T.
it does sound like environmental allergies, and it is indeed problematic to treat them at such a young age. small doses of children's allergy meds are probably fine, though. i really like the suggestion to boost his own immune system overall. lots of fresh food, as much local as you can get. local foods tend to contain elements that help counter-act local allergens. it's best to work with the body.
khairete
S.