Newborns with more leg lines on one side and less on the other is mainly due to congenital hip dysplasia or dislocation, obesity and other reasons. 1. Congenital hip dysplasia or dislocation: It may be due to genetic factors, high estrone level, delivery injury or mechanical factors, etc. The affected side has higher skin lines and accumulates more skin lines, thus showing asymmetry of leg lines. 2. Obesity: Fatter newborns may have asymmetrical leg lines due to fat distribution, which can be alleviated by reasonable intake of calories and appropriate exercise. Newborns who have more leg lines on one side and less on the other side, there may be other reasons (such as physiological factors, etc.), it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.