I say get him tested, at least it could put your mind at ease, and if he does have CF at least you can start treating it early. There's a bunch of people on this forum that weren't diagnosed till teens or later in life b/c they didn't show obvious symptoms. He may have a "mild" case. When you get tested, go to a CF Center, I've heard of inaccurate results coming from other places, hopefully one is nearby. To find one near you check out this site: http://www.cff.org/aboutCFFoundation/Locations/FindACareCenter/