Unfortunately, the cause of this birth defect is largely unknown. Some experts believe that maternal exposure during pregnancy to a chemical or virus that only mildly affects the mother might be possible causes.

Treatment:

When a child is born with a limb anomaly, the doctor refers the parents to an orthopedic specialist and a physical therapist. The child is then fitted with a prosthesis (artificial body part) as soon as possible so that he becomes comfortable with it early on.
He will also undergo intensive physical therapy so that he learns to use the prosthesis much as other children learn to control their body parts.