- Study plan: After the screening evaluation and written consent document, neonates will be randomized into two groups: nCPAP ventilation or IPV. During the 6 hours after randomization, clinical data will be monitored: cardiac and respiratory frequency (CF -RF), saturation (SaO2), oxygenotherapy, Silverman Score. Then, neonates will be supervised 3 days after normalization of the respiratory distress.