Reference for Niddah 53:8

אמר ליה רב יוסף עד כ"ד אמרת לן

ten days [after the latter's birth].<span class="x" onmousemove="('comment',' Despite the long interval between the birth of the embryo and the expulsion of the placenta no assumption was made that the placenta of the embryo in existence was lost and that the placenta in existence belonged to a second embryo that was crushed. ');">⁷</span>

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