Which organs get affected when a diaphragmatic hernia occurs?

Several: Lungs, heart, GI tract.

Lungs mainly.: The main lethality of congenital diaphragmatic hernia lies with its effect on the fetal lung development. As much of the fetal abdominal contents are inside the fetal chest during lung development, there is a great risk the lung become hypoplastic and dysfunctional. This means that without intervention many of the affected babies die at birth from respiratory failure. Fetal therapy options increas.