All on the same day.
http://www.usatf.org/News/Eight-year-old-doubles-for-AOW.aspx?
INDIANAPOLIS -- Middle distance phenom Da’mira Allen was the youngest athlete to complete a single-day double Sunday during 2016 USATF Hershey Youth Indoor Championships at the Ocean Breeze Athletic Complex on Staten Island.
Allen (Chester, Pennsylvania) of the Chester Cheetahs won consecutive medals in the 400 and 1500 meters, as she finished the quarter mile in 1:08.02 to lower the listed 1:12.40 by more than four seconds before blazing to a record-breaking 5:21.87 in the 1500m. Her 1500m time improved the age-group best of 5:34.85 by more than 12 seconds.