Genesi 35:17 Commento: Rashi, Rashbam, Sforno & Or HaChaim

כי גם זה FOR THIS ALSO — also means additional to you, over and above Joseph. Our Rabbis explained that with each of Jacob’s sons a twin-sister was born, whilst with Benjamin an additional twin sister was born (Genesis Rabbah 82:8).

אל תראי כי גם זה לך בן, in accordance with Rachel’s prayer at the time Joseph was born (30,24) when she asked G’d to grant her another son. The midwife reassured Rachel that G’d did not mean to kill her but that He had accepted her prayer. She wanted to calm Rachel‘s fear for her life.

אל תראי, do not be afraid that the infant about to be born will be a girl although your pains are so great that there is reason for suspecting this. The Talmud in Niddah 31 claims that the birth pangs associated with the birth of female children are greater than those associated with the birth of male children.