Midrash for Bekhorot 91:12
הבא אחר נפלים אע"פ שיצא את ראשו חי
OR WHEN A WOMAN DISCHARGES SOMETHING LIKE AN ANIMAL, BEAST OR BIRD.<span class="x" onmousemove="('comment',' The discharge is regarded as the opening of the womb to release the second offspring from redemption, but it is of no importance as regards inheritance.');"><sup>8</sup></span>
Sifrei Devarim
"… over the face of the son of the hated one": We are hereby taught that if his head or most of it emerged live (from the womb), he negates the next birth as a first-born.
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