Sen. Tammy DuckworthLadda (Tammy) Tammy DuckworthOvernight Defense: Pentagon details 8 billion budget request | Officials defend boost for war fund | Armed Services chair aims to 'kill' Trump plan for low-yield nuke Why block citizenship to immigrants who defend America? GOP senator says she was raped by superior officer while serving in military MORE (D-Ill.) shared a photo of her newborn daughter’s outfit for her first appearance in the Senate since a resolution passed allowing babies on the floor during votes.

“I may have to vote today, so Maile’s outfit is prepped,” Duckworth tweeted Thursday. “I made sure she has a jacket so she doesn’t violate Senate floor dress code (which requires blazers). I’m not sure what the policy is on duckling onesies, but I think we’re ready.”

The resolution cleared on Wednesday to allow Duckworth or any other senator to bring a child younger than one year of age onto the floor during votes. 

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Although some GOP senators raised concerned with the measure, it passed by unanimous consent.

Duckworth became the first senator to give birth while in office earlier this month when her daughter Maile Pearl Bowlsbey was born.

The 50-year-old senator previously said she was worried that outdated Senate rules would make it harder to do her job.

“Parenthood isn’t just a women’s issue, it’s an economic issue and one that affects all parents — men and women alike,” Duckworth said. “As tough as juggling the demands of motherhood and being a Senator can be, I’m hardly alone or unique as a working parent, and my children only make me more committed to doing my job and standing up for hardworking families everywhere.”