Genesis 29:29-31 New Century Version (NCV)
29 (Laban gave his slave girl Bilhah to his daughter Rachel to be her servant.) 30 So Jacob had sexual relations with Rachel also, and Jacob loved Rachel more than Leah. Jacob worked for Laban for another seven years.
Jacob’s Family Grows
31 When the Lord saw that Jacob loved Rachel more than Leah, he made it possible for Leah to have children, but not Rachel.