Midrash for Bekhorot 91:15
עד שיהא בו מצורת אדם
FOETUS OR A PLACENTA<span class="x" onmousemove="('comment',' There is no placenta except there be an embryo, only it has become mashed.');"><sup>11</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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