What do you think? Leave a respectful comment.

Sen. Tammy Duckworth, D-Ill., brings her baby, Maile Pearl, into the Capitol for a vote. Earlier in the week, a resolution was passed to allow children younger than one-year-old onto the Senate floor for votes. Photo By Tom Williams/CQ Roll Call

WATCH: Sen. Duckworth and daughter make Senate history

WASHINGTON — Sen. Tammy Duckworth and daughter Maile have made Senate history.

The Illinois Democrat brought her daughter, in a pink hat, onto the Senate floor under new rules that permitted it. Duckworth already is the only senator to have given birth while serving in the Senate. Maile, born April 9, is the first senator’s baby to be allowed on the chamber floor.

The history was made under a new rule passed a day earlier that permitted newborns of senators on the floor during votes. The Republican-controlled Senate held the vote open so Duckworth and Maile could adhere to the new rule. Duckworth, an Iraq war veteran and double-amputee, arrived in a wheelchair with Maile on her lap, voted no with a downturned thumb, and laughed. Her colleagues crowded around to see.

READ MORE: Babies of senators now welcome in Senate chamber

The Latest