Reference for Niddah 53:10

מעשה ונשתהה הולד אחר חבירו ל"ג יום

where the expulsion of the placenta followed the birth of the embryo.<span class="x" onmousemove="('comment',' If, however, it preceded it the possibility must be taken into consideration that it belonged to another embryo that had been crushed; and consequently the restrictions applying to the two embryos must be imposed. ');">⁹</span>

Jastrow

Jastrow