Reference for Niddah 3:3

הַמַּפֶּלֶת שְׁפִיר מָלֵא מַיִם, מָלֵא דָם, מָלֵא גְנוּנִים, אֵינָהּ חוֹשֶׁשֶׁת לְוָלָד. וְאִם הָיָה מְרֻקָּם, תֵּשֵׁב לְזָכָר וְלִנְקֵבָה:

If she miscarries a sac full of water, full of blood, or full of strands [of flesh], she need not be suspicious that it was a fetus. But if its was assembled [into a human form], she should sit for [the number of postpartum days of impurity and purity required for one who gives birth to] a male and for [one who gives birth to] a female.

Jastrow

Jastrow

Jastrow