Hadith 463
Sayyiduna Ibn Umar (may Allah be pleased with them) narrates: The Messenger of Allah (peace and blessings be upon him) said: "The unborn offspring in the belly of an animal is also slaughtered by the slaughter of its mother."
Hadith 464
Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) reports: The Prophet (peace and blessings be upon him) said: "The slaughter of the mother is sufficient for the slaughter of the unborn offspring in its womb."