Developmental hip dislocation is one of the main diseases causing physical disability in children, and the earlier it is treated, the better the results and the simpler the method is relatively. Treatment methods usually vary depending on the age, and the common treatment methods are: 1. Babies within 1 year old: Stirrup sling method Generally, babies within 1 year old do not need anesthesia, nor any first rectification, but only the stirrup sling method. In other words, the hip joint is found to be subluxed or dislocated at 8 to 9 weeks after birth, and the stirrup sling is started for 6 to 9 months. This sling restricts only the extension of the hip joint and does not restrict other activities. It can also be used as a dressing gown and an abductor swaddle support (with a wide diaper) for more than 4 months. Most of the babies can be repositioned and no aseptic necrosis of the femoral head will occur, except for a few cases where there are factors in the hip joint that prevent repositioning. 2.Baby aged 1~3 years old: Stirrup sling method or manual repositioning For some of the lighter babies, the stirrup sling method can still be used. If it cannot be reset after 4~6 weeks, a professional doctor is needed to rehabilitate the femoral head by manipulation under general anesthesia, so that the femoral head can be incorporated into the acetabulum and fixed with a “herringbone” cast, and the baby is allowed to move around with the cast. 3.Baby over 4 years old: more surgical treatment If baby is over 4 years old, usually at this time the degree of dislocation is aggravated, the secondary changes of bone and soft tissue are also more serious, and it is difficult to succeed in manual repair, the doctor will often recommend surgical treatment, to do Salter pelvic osteotomy. If the anterior tilt of the femoral neck is greater than 45 degrees, a rotational osteotomy of the femur should be added. Developmental hip dislocation, if detected and treated before the baby walks, can usually be helped to recover with just a sling, cast or brace, without any adverse effects on life. If you wait until the middle or late stages to treat it, you will often need to have it surgically repositioned, even causing lifelong regret. Therefore, parents of babies with developmental hip dislocation should not delay treatment to avoid losing the best time for treatment.