Rachel"s reaction to her barrenness and Jacob"s response contrast with how Rebekah and Isaac, and Sarah and Abraham behaved in similar circumstances. Sarah resorted to a custom acceptable in her culture, though contrary to God"s will, to secure an heir for Abraham (cf. Genesis 16:1-2). Isaac prayed that God would open Rebekah"s womb and waited ( Genesis 25:21). Rachel and Jacob followed the example of Sarah and Abraham. [source][source][source]
The conflict between Rachel and Leah focuses on love and motherhood. Rachel had Jacob"s love, but she could not become a mother. Conversely Leah was the mother of Jacob"s children, but she could not win his love. [1][source]
The account of the birth of Bilhah"s sons, Dan and Naphtali, follows ( Genesis 30:5-8). [source][source][source]