Commentary for Niddah 53:13

הניחא למאן דאמר יולדת לתשעה יולדת למקוטעין משכחת לה

stated: It once happened that the birth of an embryo was delayed for thirty-three days after that of its predecessor. 'You', said R. Joseph to him, 'have in fact told us thirty-four days.' [Such an incident may be explained] satisfactorily according to him who holds that a woman who bears at nine months does not necessarily complete the full number,<span class="x" onmousemove="('comment',' Of the nine months. Limekuta'in (from a rt. meaning 'to lop off'). ');">¹²</span>

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