In the season premier of The Pay Check, we take a close look at the single biggest reason for the gender pay gap: Motherhood. Women start out their careers earning about as much as men, but the pay gap widens to a chasm after a woman has her first child. Host Rebecca Greenfield talks to Bloomberg economics reporter Jeanna Smialek about what having a kid does to pay and why certain countries have bigger wage gaps for moms than others. We also hear from Senator Tammy Duckworth about what it’s really like to “have it all.”