Duckworth, the Illinois Democrat who this month became the first senator in US history to give birth in office, pushed for the rule change during her pregnancy.
Maile Pearl Bowlsbey is just over a week old and already she's helping force more change in the Senate than most seasoned lawmakers can even dream.
There were practical reasons for the request.
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The vote comes one day after the Senate changed longstanding rules to allow newborns onto the Senate floor during votes for the first time.
But according to Duckworth's aide, it's also about principle.
Women continue to be vastly underrepresented in the Senate, but this is a step in the right direction.
At the heart of these concerns is an underlying fear that allowing new parents to bring their babies onto the Senate floor will alter the governing body's rules of decorum.
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Australian Greens Senator Larissa Waters kisses her daughter Alia Joy after putting forward a motion on Black Lung disease in the Senate Chamber in Australia on June 22, 2017. Senators created a list that has been added to over the last century but still allows just a few people into the chamber. Because of this, they created a list that excludes anyone other than the president and vice-president, members of Congress, senators' staff members and the mayor of Washington. John Cornyn, R-Texas, called the addition a "no-brainer". Duckworth cast a thumbs-down anyway, before her colleagues descended to coo over the wee baby.
"Originally it was created to not slow down debate", Lankford said of the rules.
US Senators allowed to bring babies into chamber.
"I think it will do us good in the United States Senate, every once in a while, to see a pacifier next to the antique inkwells on our desk or a diaper bag next to one of these brass spittoons which sits on the floor, thank goodness, never used", said Sen. Or adhere to a dress code? Dianne Feinstein, D-Calif. "I'm glad we were able to get this done to address the needs of parents in the Senate", BBC quoted him as saying.
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There was more, voiced privately, Klobuchar said - including whether Duckworth meant to change Maile's diaper or nurse her new baby on the Senate floor.