The physiological process of the child’s leg shape: the child is born with O-shaped legs, about 2 years old, the legs become straight, the child continues to grow will appear X-shaped legs, X-shaped legs also called knee valgus; with growth, X-shaped legs will become heavier and heavier, reaching the maximum around 2.5 years old, and then slowly become lighter, about 6 years old become straight, or have about 5 ° or so of valgus.
Measure X-leg is the distance between the knee joints together and the inner ankle joints.