Sunday was a night for mothers in Doha as Allyson Felix, who gave birth to daughter Camryn just 10 months ago, made some history of her own. By earning her 12th gold medal as part of the winning US team in the inaugural mixed-gender 4x400m relay, Felix broke a tie with Usain Bolt for most golds in the history of the World Championships (it was also her 17th medal overall — extending her own record).

Felix ran leg 2 for a US squad that also included Wil London, Courtney Okolo, and Michael Cherry, and the Americans broke the world record — which had been established just yesterday in the prelims, also by the Americans — by running 3:09.34 to easily defeat runners-up Jamaica and bronze medalists Bahrain. While both Bolt and Felix earned multiple golds in the relays, Felix relied more heavily on them in her overall total as they accounted for 8 of her 12 golds, compared to 4 of 11 for Bolt.