Congenital clubfoot is present at birth (the definition of “congenital”) and affects the foot and/or ankle. There is no known cause for clubfoot, and it is twice as common in male children as it is in female children. The frequency of congenital clubfoot is approximately 1 per 1,240 live births. In children with clubfoot, there is a subtle imbalance in muscle forces in the lower leg resulting in the foot deformity. Often, the foot is “kidney-shaped.” About 50 percent of the time, both feet are affected with clubfoot.Although there is no known cause for congenital clubfoot, some doctors believe the use of drugs or alcohol during pregnancy or the presence of other diseases can cause it.