Toddling is an important milestone in a baby’s growth process. But if your baby walks relatively late or unsteadily, always wobbling and falling, like a duckling walking, parents should pay attention, don’t want to enjoy the baby’s cute appearance. This situation may be a developmental hip dislocation. Developmental hip dislocation is one of the more common congenital deformities in children Developmental hip dislocation, also known as congenital hip dislocation, is a disease in which the femoral head slips out of the acetabular socket when the newborn is born. It is mainly due to congenital dysplasia or abnormalities of the acetabulum, femoral head, joint capsule, ligaments and nearby muscles, resulting in joint laxity and causing hip joint subluxation or dislocation. Its incidence is about 1/250 to 1/1000, and it is more common in female infants. The cause is not completely clear yet, and may be related to the following factors 1, there is a clear family history of the disease, its incidence in the family can be as high as 20% to 30%. 2. Laxity of joint ligaments is also an important factor. Women are affected by estrogen during childbirth, which makes the pelvic ligaments lax, and the fetus will also be affected accordingly, causing ligament laxity, resulting in the newborn being prone to femoral head dislocation. 3, 2~3 months of pregnancy is the period of fetal hip joint formation, during which various factors cause its growth to stop, which may cause the joint to dislocate before normal development; 4, fetal malposition and breech delivery make the hip joint suffer mechanical pressure in an abnormal flexion position, which may easily cause dislocation of the femoral head. For children with developmental hip dislocation, usually the younger the age of treatment, the better the effect and the treatment will be relatively simple. Therefore, parents should observe their babies carefully, and if they find abnormalities such as late walking, wobbly gait or waddling, they should take their babies to regular hospitals for examination as early as possible so as not to miss the best time for treatment.