What is Hip Dysplasia? "Hip Dysplasia is the medical term used for instability of the hip joint. It can range from mild instability to complete dislocation. Around 1 in 10 full term babies are born with hip instability and 1 in 100 require treatment. Babies who have a family history or who are in the breach position during pregnancy have a higher risk of having hip dysplasia. Girls are also 4-5 more likely to have hip dysplasia than boys. Managing your baby in hip braces can be a stressful time