 METHODS: Inborn preterm infants of gestational age 26-32 weeks, with respiratory distress syndrome were enrolled in this single-centered, unblinded randomized prospective controlled trial. They were stabilized with T-piece device in delivery room. Immediately after admission of neonatal intensive care unit NICU, infants were randomly assigned to receive NCPAP with either nasal prongs or mask. NCPAP was continued by setting at PEEP as 5 to 8 cm H2O . 