Reference for Niddah 53:1

חומר שני ולדות שאני אומר

the restrictions of the two births;<span class="x" onmousemove="('comment',' If, for instance, the embryo aborted was a male, the placenta is presumed to contain the crushed embryo of a female, and the woman must, therefore, count fourteen unclean days (as for a female) and not only seven (as prescribed for a male). According to the Rabbis (who do not regard a bird or a beast as a valid birth) the restriction imposed would be to regard 'neither birth as valid and to deprive the woman in consequence of the advantage of the clean days prescribed for a woman after a childbirth. ');">¹</span>

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