And Leah conceived and bore a son and called his name Reuben…And Bilhah conceived and bore Jacob a son Regarding the sons of Jacob, Rachel and Leah gave birth to some, and their handmaidens, Bilah and Zilpah, gave birth to others. And yet, only regarding the handmaidens’ sons does the verse emphasize that they bore Jacob a son. The Torah does this, explains the Malbim, to stress that from the outset Jacob treated the children of Bilhah and Zilpah as his own.