The hip joint is one of the most important joints in the body. However, unfortunately, some babies are born with a disease called developmental hip dislocation. According to relevant statistics and reports, the incidence of this disease is about 3.18 per 1,000 in China, and it is one of the three major congenital deformities in pediatric orthopedics. Developmental hip dislocation may have serious consequences for the child if it is not detected early or is not treated in time. Some studies have shown that the disease causes the joint to be stressed from one surface, tending to one point, thus leaving the articular cartilage in a high stress state for a long time, with some data indicating that it is under 10-15 times more stress than normal children. As a result, early wear and tear of the articular cartilage will occur and joint degeneration will occur. More serious is ischemic necrosis of the femoral head, stiffness of the joint, and claudication. Therefore, the disability rate is high. However, new mothers and fathers do not need to be too nervous. If developmental hip dislocation is detected early and treated early, there are usually no serious consequences. The child will walk normally in the future and will not be affected in later life. So how can early detection be achieved? First of all, it is important to have a rough idea of the onset of the disease. The disease is more prevalent in girls, with the incidence in girls being about five times higher than in boys. Unilateral onset is about 12 times more common than bilateral onset. Second, there is some understanding of the causes of the disease. It has been suggested that the fetus plays an important role in the development of the hip joint inside the mother’s body, and that babies delivered in breech position are four times more likely to have hip dislocation than those delivered in head position. Some statistics indicate that breech births have been reported in up to 16-30% of hip dislocation cases. In addition, an infant with a relative (related by blood) who has had the disease is about 8 times more likely to have the disease than any other infant. Finally, careful observation of the child is essential. For children from birth to 1 year of age, close attention should be paid to the following signs and the possibility of developmental hip dislocation should be highly suspected: 1) less movement of one lower limb and less pedaling power than the other; 2) different lengths of skin folds on the inner thighs of the left and right sides and asymmetrical depths;