Midrash for Bekhorot 91:11
איזהו בכור לנחלה ואינו בכור לכהן
OR ONE BORN IN THE NINTH MONTH WHOSE HEAD CAME FORTH DEAD,<span class="x" onmousemove="('comment',' And was then withdrawn, the companion coming out subsequently. The first offspring therefore exempts the latter from redemption, but since it is dead, the latter offspring is the first-born as regards inheritance.');"><sup>7</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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