An 18-month-old baby girl is brought to the emergency department by her parents, as they are concerned about her noisy breathing. She has had a mild cough for the past 24 h and her temperature is elevated. She is up to date on her vaccinations and has had no developmental problems. PMH : None Examination Her oxygen saturation is 94% on air. The baby is restless and has a hoarse cry. There is an audible stridor at rest.

The baby has a low-grade fever with a mildly increased respiratory rate. There is no evidence of cyanosis. Auscultation of the chest is difficult but there is an audible inspiratory noise. What differential diagnosis do you suggest? ##Disclaimer## The content provided on Docplexus is intended for educational purposes only. While we strive to ensure its accuracy, we make no warranties, explicit or implied, about the suitability, reliability, or adequacy of the…