Midrash for Bekhorot 91:8
התם יצרו תקפו:
A FIRST-BORN WITH RESPECT TO REDEMPTION FROM A PRIEST BUT NOT A FIRST-BORN [WITH RESPECT] TO INHERITANCE; A FIRSTBORN [WITH RESPECT BOTH] TO INHERITANCE AND TO REDEMPTION FROM A PRIEST; AND [AS] A FIRST-BORN [IN RESPECT NEITHER] TO INHERITANCE NOR REDEMPTION FROM A PRIEST.
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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