Reference for Niddah 57:29

יצא מחותך או שלם וזה וזה מסורס משיצא רובו הרי זה כילוד

it is deemed born as soon as its greater part issued forth, but [it follows] if it issued in the normal way<span class="x" onmousemove="('comment',' Head first. ');">²¹</span>

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