Reference for Niddah 58:18

רבי שמעון היא דאמר

to a female child while she was in the condition of a zabah.<span class="x" onmousemove="('comment',' I.e., during the 'eleven days' that intervene between the menstrual periods. Since it is possible that she experienced painless discharges on three consecutive days during this period she must, in addition to the fourteen days (cf. prev. n.), wait a period of another seven clean days (irrespective of whether she did, or did not observe any discharge during the fourteen days) before she can attain to cleanness. ');">¹⁶</span>

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