Midrash for Bekhorot 91:6
והמטמא למתים כו':
<big><b>MISHNAH: </b></big>THERE IS ONE WHO IS [COUNTED AS] A FIRSTBORN [WITH RESPECT TO] INHERITANCE<span class="x" onmousemove="('comment',' Receiving a double share.');"><sup>4</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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