Reference for Niddah 84:11

גזרה שמא יוציא הולד ראשו חוץ לפרוזדור

what point is there in the statement that uncleanness is contracted internally as well as externally?<span class="x" onmousemove="('comment',' How can there be uncleanness in the absence of all blood? ');">¹¹</span>

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