<prompt> A 3-month-old child presents with intermittent strider. Most likely cause isLaryngotracheobronchitisLaryngomalaciaRespiratory obstructionForeign body aspiration  <response>: Laryngomalacia Laryngomalacia is the most common congenital laryngeal anomaly.It is the most common cause of stridor in infants and children.Symptoms appear in the first 2 weeks of life and increase in severity for up to 6 months.The typical presentation is inspiratory stridor which is exacerbated by any exertion crying, agitation, feeding, supine position, and viral infection of URT.Stridor is due to partial collapse of a flaccid supraglottic airway during inspiration. 