A 9-month-old girl is brought to the emergency department with three days of runny nose and moist cough, and one day of fast, noisy breathing. She is taking about two-thirds of her usual bottle feeds and has had four wet nappies in the past 24 hours. On examination she is alert, temperature 37.9°C, respiratory rate 52/min, and oxygen saturation 94% in room air. There is mild subcostal recession with widespread fine crackles and expiratory wheeze on auscultation. Which one of the following is the most appropriate next step in management?
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