(CBS NEWS) -- Sen. Tammy Duckworth, D-Illinois, says she's ready to "change some rules" in the Senate as she becomes the first sitting U.S. senator to give birth when she welcomes her second child, a baby girl due in April. Duckworth told Politico's "Women Rule" podcast that she faces an uphill battle when it comes to being a mother in office.

"For example, you are not allowed to bring children onto the floor of the Senate at all," Duckworth noted. "If I have to vote, and I'm breastfeeding my child, especially during my maternity leave period, what do I do? Leave her sitting outside?"

She added, "I can't leave her with a staff member, that's a conflict of interest, so am I allowed to vote? Can I not do my job? What are some of the requirements there?"

Duckworth said she's also being told she can't "technically" take maternity leave to care for her daughter. "Because if I take maternity leave, then I won't be allowed to sponsor legislation or vote during that time period," she explained.

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