Commentary for Chullin 139:31

בטליתו מהו

Rather it must be that it came out with the legs first.<span class="x" onmousemove="('comment',' The question 'What are the circumstances?' refers, according to Rashi, to all the cases raised by Raba, and the exposition is as follows: It certainly cannot be thought of that the garment etc. was wrapped around the foetus whilst it was still in the womb of its dam, as it is hardly possible to do so; some part therefore of the foetus must have emerged. Now it cannot be the head, for then the question could not arise, since by the emergence of the head it is deemed fully born, and so holy as a firstling. It can only be, therefore, that the legs of the foetus had emerged and then the whole of it was wrapped up. According to the variant text adopted by Tosaf. (v. n. 2) and the interpretation suggested, this question of the Gemara refers only to the last question of Raba, and the exposition is as follows: If the head of the female twin came out first, then the male cannot in any circumstance be deemed holy as a firstling, for it had not 'opened the womb' but was born second. It must be, therefore, that the legs of the female twin came out first, and these were wrapped around the head of the male, so that, were it not for the question of direct contact with the womb, the male twin, being born first, by virtue of the emergence of its head, would he deemed a firstling.');">¹⁴</span>

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