Amputation of parts of the fetus in utero, formerly believed to be caused by constricting bands but now believed to be a developmental defect.
The detachment of a body part, such as a limb, finger, or toe, from the rest of the body occurs when the blood supply to that specific part is obstructed within the womb due to an amniotic band a band of fetal membrane. Upon birth, the affected part may either be completely separated or exhibit visible indications of the presence of the “amniotic band.”