Other causes include local trauma, compression of the recurrent laryngeal nerve from intubation, or in some cases, laryngopharngeal reflux.

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Severe respiratory failure may require insertion of a tube into the trachea (intubation) to assist the child's breathing until the infection is brought under control.

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Do you want aggressive treatments such as intubation and mechanical ventilation?

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Children's Hospital of Philadelphia declined an interview with CNN for this story, but Janet said doctors are telling her that Sarah could "crash" any time now and need intubation, the insertion of a tube into her lungs for breathing assistance.

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