<unk>  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.<unk>  can also occur due to maternal exposure to teratogens during pregnancy.
Congenital amputation
Hand injury
Burn scar contracture
Brachial plexus injury
Heel stick wound
Malunion
Stingray injury
Vein graft failure