Congenital Diaphragmatic Hernia Congenital diaphragmatic hernia (CDH) is a birth defect that occurs when a baby’s diaphragm doesn’t correctly form during fetal development. More Information More Home Doctors Services Home Doctors Services Showing 1 - 1 of 1 Services and Treatments Changing this value will reload the page with your results Service General Pediatric Surgery Lehigh Valley Reilly Children’s Hospital is home to the largest pediatric surgery team in the region. We offer state-of-the-art care for routine surgical procedures and are on the leading edge in minimally invasive (small-scar) pediatric techniques.