Developmental Dysplasia of the Hip
(DDH), Congenital Hip Dysplasia (CHD)
"If pressure in the womb presses the fetal leg too severely, the socket can flatten. It may well go unnoticed. The softer the cartilage (girls are softer because they react to mom's hormones) and the more the push (usually the left leg gets it worse as it is usually up against the spine), the more the odds of a flattened socket. Girl babies get hip dysplasia (socket flattening) 9 times more than boys. Breech position is just plain nasty to the hips and squashes hips about a third of the time."
--Pediatric Orthopedics, PC, Summit, New Jersey
http://www.pediatric-orthopedics.com/Treatments/Hips/Prevent/prevent.html
