This graph demonstrates the normal transition from genu varum (birth to age 2) to excess genu valgum (peaks at age 3) and eventual normalization to an adult pattern (5 to 7 degrees valgum) - from Salenius P, Vankka E: The development of the tibiofemoral angle in children. JBJS 1975;57:259 (Copyright Journal of Bone and Joint Surgery; used with permission)