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Sen. Tammy Duckworth, D-Illinois, became the first sitting USA senator to give birth while holding office, with the delivery of her second daughter on Monday. Their first, Abigail, was born on November 18, 2014, when Duckworth was a member of the House.

Duckworth's daughter, Maile Pearl Bowlsbey, was born on Monday, her office said in a statement.

"I've had multiple IVF cycles and a miscarriage trying to conceive again, so we're very grateful", she told The Sun-Times.

She says she's grateful to friends and family and "our wonderful medical teams for everything they've done to help us in our decades-long journey to complete our family".

Then-U.S. Rep. Tammy Duckworth D-Ill., speaks Tuesday, March 15, 2016, in Chicago.

And she's the first-ever child to be birthed by a sitting United States Senator.

She expressed her and her family's thanks to the former Hawaii Sen.

She had previously called attention to the Senate's lack of official procedures for pregnant members and pointed out that she could not, technically, take maternity leave.

Duckworth, 50, announced her pregnancy in January. Duckworth said her experiences as a working mother give her an "important and underrepresented perspective" in Congress and motivate her to advocate for working families. She chose to fly helicopters, this being one of the only options open to women.

Tammy said, "Parenthood isn't just a women's issue, it's an economic issue and one that affects all parents-men and women alike".

Duckworth's proposed rule change would allow any senator to bring a baby onto the Senate floor within the first year of the child's life. She served as a helicopter pilot in Iraq, where she lost both her legs when her UH-60 Black Hawk helicopter was struck by a rocket-propelled grenade. "I don't consider myself unique, because there are billions of working parents, and my children will only motivate me to do my job", she said.