Babies with leg lines that are more on one side and less on the other are more likely to have hip dysplasia, including acetabular dysplasia, hip subluxation, and hip dislocation. Regardless of what the condition may be, it is recommended to visit a specialized pediatric orthopedic clinic for examination. The following four groups of people usually need to be extra vigilant in this case: 1. Hip dislocation has a certain genetic correlation; 2. There are significantly more girls than boys; 3. It is related to the position of the body at the time of birth, and the children born in breech position and cesarean section are significantly higher than those who are born naturally; 4. Those who are accompanied by other deformities, such as horseshoe feet and cervical inclination, need to be paid attention to in the first place. In this case, up to 6 months can be recommended to do ultrasound, screening tests; 6 months and above is recommended to take x-rays to clarify the diagnosis.