This study looks at whether stopping the use of inhaled nitric oxide (*iNO*), a gas used to help newborns breathe, affects babies with a condition called congenital diaphragmatic hernia (*CDH*). CDH is when a baby is born with a hole in the diaphragm, the muscle that helps with breathing. The study aims to see if not using iNO changes the need for a special life support machine (*ECLS*) and if it affects the baby's chances of survival and breathing. It also checks if stopping iNO saves money on healthcare. In the study, some hospitals will stop using iNO at different times, like taking turns. The study includes babies with CDH diagnosed within the first month of life and excludes those diagnosed later or with a different type of hernia.

• The study involves several hospitals participating in turns.
• Babies will be included if diagnosed with CDH before 1 month old.
• There is no direct mention of compensation or treatment risks.