My baby is 4 mo, He makes no treatment, only reviews, a negative sweat test, a chest x-ray, no medicine, take vitamins a, d, c and iron as a normal baby, is exclusive breastfeeding, he sleeps well, no cramps, no reflux, is very easy, always smiling, never sick, never cold, nothing to indicate that he feel bad, like you I thought it would be their mutations in cis, but we've done studies, and the mutations are in trans, has the deltaF508 in cis with 7T, which is very rare.