 Many preterm very low birth weight infants require continuous positive airway pressureCPAP for breathing support because of lung immaturity. CPAP can be delivered by the infant flowTM device which is well studied. Prolonged use of nasal prongs CPAP has been shown to cause discomfort and, rarely, nasal injury leading to long term disfigurement. On the other hand, High flow nasal cannula HFNC ,which is another modality of delivering CPAP, creates less pressure on the nose and less disfiguring effect but previous research showed that the use of HFNC may be less effective than IF-CPAP in providing breathing support in these infants. 