Kommentar zu Bereschit 25:22

ויתרצצו AND [THE CHILDREN] STRUGGLED — You must admit that this verse calls for a Midrashic interpretation since it leaves unexplained what this struggling was about and it states that she exclaimed “If it be so, wherefore did I desire this” (i.e. she asked whether this was the normal course of child-bearing, feeling that something extraordinary was happening). Our Rabbis explain that the word ויתרוצצו has the meaning of running, moving quickly: whenever she passed by the doors of the Torah (i. e. the Schools of Shem and Eber) Jacob moved convulsively in his efforts to come to birth, but whenever she passed by the gate of a pagan temple Esau moved convulsively in his efforts to come to birth (Genesis Rabbah 63:6). Another explanation is: they struggled with one another and quarrelled as to how they should divide the two worlds as their inheritance (Yalkut Shimoni on Torah 111:2).

AND SHE SAID: IF IT BE SO, ‘LAMAH ZEH ANOCHI?’”If the pain of pregnancy is so great, lamah zeh anochi (why did I) pray for and aspire to pregnancy?” Thus Rashi. But it is not correct.²²For the word anochi (I), according to Rashi, implies “I prayed for pregnancy.” And this, comments Ramban, is not correct. (Gur Aryeh.) Rabbi Abraham ibn Ezra says that she asked the women if they had experienced such pains, and they said, “No,” whereupon she said, “If the matter and custom of pregnancy be as they said, lamah zeh anochi, why am I beset with an unusual pregnancy?” Now according to this exposition, the verse is missing and not complete.²³Her inquiring of other women as to their experiences with pregnancy is not even mentioned explicitly although it is central to the thought expressed in the verse, according to Ibn Ezra.
The correct interpretation in my opinion is that she said, “If it shall be so with me, lamah zeh anochi, [why am I in the world]? Would that I did not exist, that I should die or never have come into existence.”²⁴The J. P. S. translation, If it be so, wherefore do I live?, follows Ramban’s interpretation. This is similar to the verse, I should have been as though I had not been.²⁵Job 10:19.

ויתרוצצו, as soon as the fetuses had developed to the point where they were able to move, they moved far more violently than is the custom, so that Rivkah had the impression that quarrelling was going on inside her.