This video presents a detailed case study of a 24-year-old mother with a late diagnosis of severe congenital diaphragmatic hernia (CDH) at 28 weeks of gestation. Pediatric Surgeon Dr. Beth Rymeski from Cincinnati Children's Hospital highlights the successful application of Fetal Endoluminal Tracheal Occlusion (FETO) to promote fetal lung development. The presentation covers the diagnostic findings, FETO procedure, maternal and neonatal course, and the significant increase in fetal lung volume achieved, demonstrating a positive outcome for a critically ill infant.