On April 23, 2019, Caufield scored his 10th and 11th goal for the NTDP in just four games of preliminary round at the 2019 IIHF World U18 Championship, breaking a record set by both Brett Sterling in 2002 and Phil Kessel in 2005 (nine goals). On April 27, 2019, Caufield tied Alexander Ovechkin's single tournament goals record (14 goals from 2002) and inscribed his 18 career goals in the national record book of the tournament. The NTDP would eventually lose their semi-final matchup to Russia 3–2 in a shootout, with the NTDP claiming a bronze medal in a 5–2 win over Canada to close their tournament play. Caufield was named the MVP of the championship, as well as Best Forward (Directorate Award). Finally, he led the competition in goals and was named to the tournament All-star team.