Newborns may have temporary asymmetry of the leg lines, which can subside naturally with the normal development of the legs around one year of age; however, congenital hip dysplasia cannot subside naturally. When checking the asymmetry of the baby’s leg lines, you need to put the child on the bed on his back, the child’s knees are flexed, observe whether the knee height is the same, after the knees are flexed, the two legs are adducted and externally rotated, observe whether the adduction and external rotation is limited, and observe whether there is the sound of the carat, which is necessary to exclude congenital hip dysplasia. In normal children, as they grow older, the asymmetry of the leg pattern will disappear naturally when the development of the leg pattern is more perfect around one year old. However, patients with congenital hip dislocation will have limited abduction and external rotation, along with the sound of carat. This is a pathological phenomenon, and most of them cannot be cured by themselves. It can be immobilized with plaster casts, and surgery is needed if necessary. If you find that your baby’s leg lines are not symmetrical, it is recommended that you can consult the pediatric surgery department of a regular hospital to make a judgment.