Reference for Niddah 47:65

במה דברים אמורים כשיצא לאויר העולם אבל במעי אמו שרי יצא מי שיש לו שני גבין ושני שדראות דאפילו במעי אמו נמי אסור

explains it in accordance with his view. 'Rab explains in accordance with his own view', thus: A four monthly embryo among small cattle and an eighth monthly one among large cattle, and one that is younger is equally forbidden. This applies only where it saw the light<span class="x" onmousemove="('comment',' Lit., 'went out to the air of the world'. ');">⁶⁰</span> but while it is still in its dam's bowels it is permitted; but from this is excluded one that has two backs and two spinal columns which, even while still in its dam's bowels, is also forbidden.

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