Infant leg lines can be observed by looking for symmetry in the texture between the buttocks and thighs, among other things. Infant leg lines are usually observed when the baby is in the prone position, mainly by observing whether the texture between the buttocks and thighs is symmetrical or not, and the leg lines of normal infants should be symmetrical. However, obese children may have asymmetrical leg lines, you can lay the baby flat on the bed, so that its legs are bent and together, to observe whether the height of the two knee area is the same, the common causes of asymmetrical leg lines, including hip dislocation and so on. When the baby appeared asymmetric leg lines, should be timely to the regular hospital, and under the guidance of the doctor for examination, if necessary, follow the doctor’s instructions for treatment.