It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: For the unborn offspring in the womb, the slaughter of its mother is sufficient for its own slaughter.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11343
Hadith Gradingحکم دارالسلام:حديث صحيح بطرقه وشواهده ، وهذا إسناد حسن