Lower limb alignment follows a predictable pattern. Infants typically have a gentle vaus bow (i.e. Bowleggedness) throughout the femur and tibia. By 18-24 months, the lower leg is nearly straight with a neutral mechanical axis. Valgus (i.e. Knock Knees) gradually develops and is most apparent between 3 and 4 years of age. By 7 years of age, the lower limb attains the adult position of slight valgus.