Midrash for Bekhorot 91:19
רבי יוסי הגלילי אומר
IF ONE WHO NEVER HAD CHILDREN PREVIOUSLY MARRIED A WOMAN WHO HAD ALREADY GIVEN BIRTH,<span class="x" onmousemove="('comment',' The infant in this case is a first-born in respect of inheritance but not of redemption, since the right of inheritance is determined by the father, Scripture saying: 'The beginning of his strength', whereas for redemption it is the opening of the womb which is necessary.');"><sup>14</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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