It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that he said: "The fetus is to be slaughtered so that all the blood inside it flows out."
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :موقوف، إسناده ضعيف. » «انفرد به المصنف من هذا الطريق»
Ahmad bin Mani' said: It is narrated from Sayyiduna Ka'b bin Malik (may Allah be pleased with him) that he asked the Prophet (peace and blessings be upon him) about the fetus (the young in its mother's womb), and he (peace and blessings be upon him) said: "Its (the fetus's) slaughter is the slaughter of its mother."