Reference for Niddah 61:6

למה ולד דומה במעי אמו

the embryo occupies the lowest chamber, during the middle ones it occupies the middle chamber and during the last months it occupies the uppermost chamber; and when its time to emerge arrives it turns over and then emerges, and this is the cause of the woman's pains.<span class="x" onmousemove="('comment',' At a childbirth. ');">⁵</span>

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