A 10-month-old child has been brought into the emergency room (ER) by his or her parents, who state that after few days with low-grade fever, malaise, and rhinorrhea, their child presented with a "barking" cough and increased work of breathing. What condition is this child likely exhibiting?

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The child with LTB presents with a gradual prodrome of low-grade fever, malaise, rhinorrhea, and hoarse voice. Over several days, the illness progresses to inspiratory stridor and a "barky" cough, often described as sounding like the bark of a seal. Physical examination reveals nasal flaring, nasal congestion, use of accessory muscles, and suprasternal, subcostal, and intercostal retractions that, along with the stridor, become worse when the child is agitated.

A 10-Month-Old Child Has Been Brought into the Emergency Room