A 9 months old male child presented ,1·ith the complaints of failure to thriYe. F{;(·r;mg had been inadequate because of fatigue on sucking. He deYeloped noisy breathing at 5 months of age and was treated for repeated respiratory tract infections without a specific diagnosis. Physicai examination reYcalccl that his height and weight were helo\\ tne third percentile. He had noticeable i'lterc,,s...