Stridor is a common presenting symptom in young children and is produced by turbulent flow through the upper airway or trachea. In children under 12 months of age, stridor is commonly caused by laryngomalacia, tracheomalacia, croup, airway foreign body, and/or retropharyngeal abscess. In atypical presentations of stridor, soft tissue neck radiographs can be helpful to determine the underlying etiology. Occasionally, children will require bronchoscopy to determine the etiology and treatment.