Infants with CDH are at risk for pulmonary hypoplasia and pulmonary hypertension and often experience hypoxemia and acidosis during neonatal transition. The standard approach to DR resuscitation is immediate umbilical cord clamping (UCC) followed by intubation and mechanical ventilation. Animal models suggest that achieving lung aeration prior to UCC results in improved pulmonary blood flow and cardiac function compared with immediate UCC before lung aeration is established. Trials of preterm infants demonstrated that initiating respiratory support prior to UCC is safe and feasible. Because infants with CDH are at high risk for pulmonary hypertension and systemic hypotension, they may benefit from the hemodynamic effects of lung aeration before UCC, namely increased pulmonary blood flow, decreased pulmonary vascular resistance, and improved cardiac output. To date, this approach has not been studied in infants with CDH.