Reference for Chullin 137:6

קלוט בן פרה אסור הני מילי היכא דיצא לאויר העולם אבל במעי אמו שרי

And [it is permitted even] according to R'Simeon, For although R'Simeon ruled that an animal with uncloven hoofs which was brought forth by a cow is forbidden, that is so only where it came forth into the world, but where it was still in the womb of the dam it is permitted.

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