A 5-month-old girl was referred for failure to thrive and symptoms of bronchiolitis. Her history revealed that she was born at term from an uncomplicated pregnancy, with a birth weight of 3.22 kg (50th percentile). Her family history was unremarkable and her medical background was only significant for an episode of bronchiolitis at the age of 3 months, for which she had not been hospitalized. At that time, she weighed 5.55 kg (15th percentile). Following that episode, respiratory symptoms had resolved. However, feeding difficulties had been noted over the 2 months preceding presentation. Two days before admission she developed nasopharyngeal secretions and had an increased cough. The baby had never experienced vomiting or diarrhea.
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