。Assessment: Natural history of RDS is to worsen over the first 48 h Consider pneumothorax etc 。Actions: Transilluminate -Intubate 3.0 ETT Intubation criteria: Severe respiratory distress -PaC02>60 FiO2 in preterm infant>60% Diagnosis of moderate RDS with availability of surfactant Place umbilical arterial line• Assessment: – Natural history of RDS is to worsen over the first 48 h – Consider pneumothorax etc • Actions: – Transilluminate – Intubate 3.0 ETT • Intubation criteria: – Severe respiratory distress – PaCO2 > 60 – FiO2 in preterm infant > 60% – Diagnosis of moderate RDS with availability of surfactant – Place umbilical arterial line