Reference for Niddah 64:4

למה לי

I would only infer that a woman [is subject to the restriction of <i>zibah</i>], whence, however, could it be deduced that a female child that is ten days old<span class="x" onmousemove="('comment',' One younger than ten days cannot possibly be subject to this form of uncleanness since one cannot be a confirmed zabah before the elapse of seven days of menstruation and three subsequent days on each of which a discharge is observed. ');">⁴</span>

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