Tafsiran Kejadian 30:3: Rashi, Radak, Sforno & Or HaChaim

על ברכי UPON MY KNEES — as the Targum takes it: she will bear children and I will rear them.

ותאמר, she said that after Yaakov had explained to her that her failure to have children was G’d’s doing, she suggested what Sarah had suggested to Avraham, that she was willing to become a vicarious mother through her servant maid having a child by him. She therefore asked Yaakov to sleep with Bilhah.

בוא אליה, this was Rachel’s answer to her husband’s accusation. She had not meant that it was within Yaakov’s power to make her pregnant, but she wanted to nurse a child by the next best method, that of becoming foster mother to her handmaid’s child.

ואבנה גם אנכי AND I ALSO MAY HAVE CHILDREN — What force has “also”? She said to him, “Your grandfather, Abraham, had children from Hagar and yet he girded up his loins (actively interceded) for Sarah and she afterwards was blessed with a child”. He replied, “But my grandmother brought an associate wife unto her house”. She retorted, “If that is what prevents me being blessed with children, הנה אמתי BEHOLD MY HANDMAID” etc.