The asymmetry of the leg lines of a 2-month-old baby may be caused by physiological or pathological factors, which need to be decided according to other physical characteristics, and observe whether there is stiffness of the joints, shortening of the affected limbs, etc., and if there is, it is not normal. 1. Physiological factors: 2-month-old babies with asymmetrical leg lines may be caused by physiological factors, such as the baby is fat, fat distribution is not uniform, it is easy to appear asymmetrical leg lines, the later will slowly disappear with the growth and development, without special treatment. 2. Pathological factors: baby if other abnormalities, such as joint stiffness, shortening of the affected limbs, etc., is a pathological cause, such as hip dysplasia, hip dislocation, etc., later with the baby’s age, may also appear walking bumps, lower limb activity abnormalities. Prompt consultation and early treatment are recommended. Parents should follow up with the pediatrician regularly to understand the growth and development of their babies, and diagnose and treat any abnormalities in time.