Birdsong started 2023 with San Jose before being promoted to the Eugene Emeralds.
On July 4, he combined with Mat Olsen, William Kempner, and Sam Delaplane to throw a no-hitter against the Tri-City Dust Devils.
[2] Birdsong began the 2024 campaign with Richmond, and was promoted to the Triple–A Sacramento River Cats after logging a 2.05 ERA with 61 strikeouts across 11 starts.
On June 26, 2024, Birdsong was selected to the 40-man roster and promoted to the major leagues for the first time.
[3] He made his major league debut the same day at Oracle Park against the Chicago Cubs, allowing three runs in 4+2⁄3 innings.