Pediatrics Respiratory System b3e53320 The most common cause of stridor in infant and children is: A Congenital subglottic stenosis B Laryngomalacia C Vocal Cord Paralysis D Foreign body in airway High-Yield Explanation b. Laryngomalacia(Ref: Nelson's 20/e p 2036; Ghai 8/e p 369)Laryngomalacia is the most common cause of stridor in infants and children.