Fetal Endotracheal Occlusion (FETO) in Fetuses With Severe Congenital Diaphragmatic Hernia

The goal of this pilot trial is to learn more about the role of Fetal Endotracheal Occlusion (FETO) as an intervention in fetuses with severe congenital diaphragmatic hernia (CDH). The research team will investigate the feasibility and safety of the FETO procedure, as well as determine whether FETO can improve lung growth before birth, and survival after birth. This study will enroll 10 pregnant participants to undergo the FETO procedure at a gestational age of 27 weeks 0 days to 29 weeks 6 days. The participant will be monitored for a few weeks, and then the FETO removal procedure will be performed ideally at 34 weeks 0 days to 34 weeks 6 days, but may be indicated earlier as determined by the Maternal Fetal care team. The pregnant participant and their baby will continue to be monitored during delivery and up until the child reaches 2 years of age.