For the source text click/tap here: Chullin 74
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In the Mishnah on our daf we find that although Rabbi Meir rules that an animal that dies in its mother’s womb (or is not fully developed) becomes permitted by means of shechita performed on its mother, if it is fully developed then it would need its own shechita. The Chachamim disagree, arguing that the mother’s slaughter permits the fetus. Rabbi Shimon Shezuri goes so far as to state “even if it is five years old and is plowing the field, the slaughtering of its mother renders it permitted.”
We explore the history of abortion in antiquity.