Reference for Niddah 57:39

מכלל דבמסורס רובו נמי לא פוטר הא קי"ל דרובו ככולו

If the embryo issued in pieces and in a reversed position it is deemed born as soon as its greater part issued forth, but [it follows] if it issued in the normal way the head alone causes exemption.<span class="x" onmousemove="('comment',' Cf. n. supra, sc. the embryo is deemed to have been born, in agreement with the view of R. Johanan. ');">²⁸</span>

Jastrow

Jastrow

Jastrow

Jastrow