Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) used to say: When a she-camel is slaughtered, the fetus in her womb is also considered to have undergone proper slaughter, provided that all its limbs are fully formed and its hair has completely grown. If the fetus comes out of the womb alive, then it is necessary to slaughter it so that its blood may flow out from its body.