Fetal Endoscopic Tracheal Occlusion for Congenital Diaphragmatic Hernia (FETO)

This trial is testing a procedure called FETO (fetal endoscopic tracheal occlusion) — a surgery done on a baby still in the womb — to help fetuses with a serious condition called congenital diaphragmatic hernia (CDH), where a hole in the diaphragm allows organs to crowd the lungs, preventing them from developing normally. **You may be eligible if...** - You are carrying a single baby (not twins) - Your baby has been diagnosed with an isolated left-sided CDH with the liver pushed up into the chest - Tests show the baby's lung size is severely underdeveloped (based on specific ultrasound measurements) - You are enrolled before 29 weeks and 6 days of pregnancy - Your baby's chromosomes are normal **You may NOT be eligible if...** - You are carrying more than one baby - Your baby has other birth defects in addition to CDH - Your baby has CDH on the right side - The CDH is mild or moderate rather than severe Talk to your doctor to see if this trial is right for you.