In preterm infants with respiratory distress syndrome (RDS), the application of continuous positive airway pressure (CPAP) is associated with benefits in terms of reduced respiratory failure and reduced mortality. We conducted this prospective study to evaluate the effectiveness of bubble-CPAP as primary mode of respiratory support. Bubble CPAP was found to be safe and effective means of treating mild and moderate grade RDS, it was also observed to be more successful in babies born to mothers who had received antenatal steroids.