Baby leg lines asymmetry may be normal physiological factors, such as the baby belongs to the obese body, but also may be related to hip dysplasia pathological factors, specific analysis is as follows: 1. physiological factors: baby if the leg lines asymmetrical, while the body is more obese, this situation and their own muscular development, belongs to a normal physiological factors, without special treatment. 2. Hip dysplasia: baby hip dysplasia may also appear in the above situation, but also accompanied by walking bumps, often in a flexed position, it is difficult to straighten the adverse reactions, need to go to the hospital in time for ultrasound examination. The baby leg lines asymmetry may also have other reasons, it is recommended to go to the hospital in time for relevant examinations, clear causes of the disease after active symptomatic treatment.