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A neck X-ray is done to make sure that your baby does not have other problems below the voice box (in the subglottis, trachea or chest).
Biphasic stridor -- This occurs when your child breathes in and out, and it indicates a narrowing of the subglottis, the cartilage right below the vocal cords.
Narrowing of the subglottis, or area below the vocal cords.
Enlarge+Subglottic stenosis is a narrowing of the airway below the vocal cords (subglottis).