Sayyiduna Abu Umamah and Sayyiduna Abu al-Darda (may Allah be pleased with them both) both said that the Messenger of Allah (peace and blessings be upon him) said: "The slaughter of the unborn young (janin) is included in the slaughter of its mother."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7467