Jacob's wives and concubines compete to the have the most babies, with God inspecting, opening, and closing wombs, as required.
Here's my slave, Bilhah. Have sex with her (30:3)
Rachel solved her fertility problem the same way Sarah did in Genesis 16:2.
Leah couldn't get pregnant again (30:9)
Leah got a big headstart in baby-making contest when God opened her womb, resulting in four consecutive children. But I guess after thant, God shut her womb again.
Reuben found some mandrakes (30:14)
Mandrakes are narcotic plants in the Solanaceae family, with many associated superstitious beliefs. Their bulbous roots sometimes resemble male sexual organs and were thought to be aphrodisiacs. Unfortunately, they only grow where the semen of a hanged man falls to the ground, so they are rare nowadays. If you find one, don't dig up the root; if you do, you will be instantly killed by its scream.