Congenital Diaphragmatic Hernia is a birth defect that occurs when the diaphragm does not fully form, allowing some of the organs in the abdomen, including the stomach, intestine, liver, spleen and kidneys, to move into the chest, preventing normal lung growth. Early in pregnancy, before the baby's diaphragm is completely developed, a hole does exist in the diaphragm, but this normally closes by the end of the third month of pregnancy. Congenital diaphragmatic hernia is the absence of the diaphragm, or a hole in the diaphragm. CDH occurs in about one in every 2,500 births. There is no known cause of CDH at this time.
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