This trial is studying what happens when doctors stop using a gas treatment called inhaled Nitric Oxide (iNO) in newborns with severe breathing problems due to Congenital Diaphragmatic Hernia (CDH). The gas treatment helps open up blood vessels in the lungs to improve oxygen levels. Researchers want to see if stopping this treatment affects survival rates and the need for advanced life support, as well as its cost-effectiveness. Inhaled nitric oxide (iNO) has been used to treat respiratory failure in newborns, including those with congenital diaphragmatic hernia (CDH), to improve oxygenation.