It happens: Croup is generally triggered by a variety of upper airway viruses that attack the airway just below the vocal cords. The accumulation of mucous triggers the cough & the weakening of the airway allows the weird crowing. The second night is usually worse than the first, the 3rd like the first, then it gradually improves. If she is not drinking & staying hydrated she needs a recheck.
Answered 3/17/2018
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