<prompt> The narrowest part of larynx in infants is at the cricoid level. In administering anaesthesia this may lead to all exceptChoosing a smaller size endotracheal tubeTrauma to the subglottic regionPost operative stridorLaryngeal oedema  <response>: Subglottic region cricoid region is the narrowest part of larynx in infants. Mucosal trauma to force a tube can cause post-operative edema, stridor, croup and airway obstruction.The size of tube is very important, both oversize and undersize tube are dangerous :-Oversize tube will increase the chance of trauma and post intubation edema, croup stridor.Undersize tube will increase the chance of aspiration because uncuffed tubes are used in children and the best way to prevent aspiration is to use appropriate size tube. 