Congenital amputation
Congenital amputation is birth without a limb or limbs, or without a part of a limb or limbs. It is known to be caused by blood clots forming in the fetus while in utero (vascular insult) and from amniotic band syndrome: fibrous bands of the amnion that constrict fetal limbs to such an extent that they fail to form or actually fall off due to missing blood supply.