ABFM Practice Test 10

A 4-month-old boy born at term is seen in the office with 3 days of rhinorrhea and cough and 1 day of mild wheezing. He is taking about 80% of his usual feeds and has normal wet diapers. Temperature is 38.0°C (100.4°F), respirations 48/min and oxygen saturation 96% on room air. Examination shows mild subcostal retractions, diffuse fine crackles and expiratory wheezes. He has no prior wheezing and no family history of asthma or atopy. Which one of the following is the most appropriate management?