This retrospective analysis documents the usefulness of fiberoptic bronchoscopy in finding the etiology of 56 cases of unresolved atelectasis in infancy, over a two year period (June 2005 to May 2007). Fiberoptic bronchoscopy identified the etiology leading to a revised diagnosis and change in management strategy in 38 (67.8%) cases, which included congenital airway anomalies (46.4%), inflammatory changes (10.7%), mucus plugs (28.5%), hypoplasia (4%), endobronchial granulation tissue (3.5%) and foreign body (3.5%). Fiberoptic bronchoscopy plays an important role in diagnostic work up of infants with unresolved atelectasis.