Feto-Endoscopic Tracheal Occlusion (FETO) for Severe Congenital Diaphragmatic Hernia

This study is testing a procedure called FETO (fetal endoscopic tracheal occlusion) — a surgery performed on a baby still in the womb — for babies with a serious birth defect called congenital diaphragmatic hernia (CDH), where organs from the belly push into the chest and prevent the lungs from growing properly. **You may be eligible if...** - You are pregnant with a baby diagnosed with CDH (no other major birth defects present) - The baby's liver is displaced into the chest - The baby's lung measurements on ultrasound show severe or moderate underdevelopment - The procedure would be performed between 27 and 31 weeks of pregnancy - You are the mother and are 18 years of age or older **You may NOT be eligible if...** - Your baby has other major birth defects in addition to CDH - The timing or severity of the condition falls outside the criteria for the procedure - There are signs that the baby or mother needs immediate delivery - You are past 29 weeks 6 days of pregnancy at the time of enrollment (for the severe group) Talk to your doctor to see if this trial is right for you.