Inclusion Criteria:  Postnatal, live born neonates with CDH  a. Presence of associated or additional anomalies is acceptable for inclusion  Bochdalek hernia location (right or left) Diagnosed prior to 1 month of life Born within or transferred to (within 1 week of life) a CDHSG member center participating in the trial  Exclusion Criteria:  CDH diagnosis after 1 month of age Morgagni diaphragmatic hernia (central / anterior-medial diaphragmatic defect location) Transferred to a CDH Study Group (CDHSG) member center after 1 week of life Patients without potential access to iNO