Mild genu valgum is diagnosed when a person standing upright with the feet touching also shows the knees touching. It can be seen in children from ages 2 to 5, and is often corrected naturally as children grow. However, the condition may continue or worsen with age, particularly when it is the result of a disease, such as rickets or obesity . Idiopathic genu valgum is a form that is either congenital or has no known cause.
In normal developmental, the knees show maximal bowing (genu varum) in the newborn period, straightening between 20 and 22 months of age, and reversal into maximum valgus angulation of 10 to 15 degrees at approximately 3 years of age, followed by gradual reduction of valgus to the normal “adult” level of 5 to 7 degrees by 6 to 7 years of age.