US Senator Tammy Duckworth, 50, has given birth to a daughter, becoming the first sitting female US senator to give birth while in office.
The Illinois Democrat said on Twitter that Maile Pearl Bowlsbey was named after her husband's great aunt, who served as a nurse during World War Two.
In a series of tweets, she also thanked her family and medical team.
Ms Duckworth is an ex-army helicopter pilot who had both her legs amputated after crashing in Iraq in 2004.
The Iraq War veteran had previously made history when she became the first woman with disabilities elected to the US senate.
She becomes one of only 10 women to ever give birth while holding elected federal office, according to US media.
Baby Maile - the couple's second daughter - was born in a suburban Washington DC hospital on Monday.
Ms Duckworth, whose mother was from Thailand, was also among the first Asian-American women ever elected to Congress.
In 2018, Ms Duckworth has authored several bills to help new mothers, including a bill to make airports offer a place for women to breastfeed or pump milk.
She has also called for the military to enact a policy to give personal time for new mothers to bond with newborn and adopted babies, and to make sure that student parents have access to on-campus child daycare centres.