This is also a common congenital anomaly, occurring in about one of every 1500 newborn infants.CDH is ten times more common in girls than in boys. In this anomaly the capsule of the hip joint is abnormally relaxed at birth and there is underdevelopment of the acetabulum of the hip bone and head of the femur.
Dislocation usually takes place after birth.CDH is commonly observed in those babies who are breech deliveries (in a breech delivery the fetal buttocks present first). This fact suggests that breech position during terminal months of pregnancy may interfere with normal development of the acetabulum and head of the femur.