US sprinter Allyson Felix beats Usain Bolt's gold medal record 10 months after giving birth

Allyson Felix runs after receiving the baton in the mixed 4x400 meter relay race during the World Athletics Championships in Doha, Qatar, Sunday, Sept. 29, 2019. (AP Photo/Martin Meissner)

DOHA, Qatar (WTSP) — A 33-year-old U.S. sprinter broke a world record for gold medals Sunday, toppling former record-holder Usain Bolt.

Allyson Felix won her 12th gold medal at the World Championships during the mixed-gender 4x400m relay, Business Insider reports. Bolt was the previous World Championships record-holder, since 2013, with a total of 11 gold medals.

It was Felix's first race since giving birth to her daughter, Camryn, in November 2018.

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Felix has made four Olympic appearances. She has a combined nine medals — six of which are gold, CNN reports.

How did she summarize her big record-breaking win?

"Humbled," she wrote in a tweet.

Not only has she broken records, Felix continues to inspire others. Speaking with ESPN in 2018, she discussed the emotional toll of having her daughter in the NICU as a preemie born at 32 weeks following an emergency C-section.

As Felix gets ready for her fifth Olympics, she also has been vocal against Nike's long-standing maternity policies for sponsored athletes. She's pushing so that she and other female athletes won't be impacted financially for being pregnant.