Suggs won a gold medal with the United States at the 2017 FIBA Under-16 Americas Championship in Formosa, Argentina. In four games, he averaged 7.5 points and 2.8 rebounds per game. At the 2018 FIBA Under-17 World Cup in Argentina, Suggs averaged 8.7 points and 3.3 steals per game and won another gold medal. He joined the United States at the 2019 FIBA Under-19 World Cup in Heraklion, Greece, averaging 9.6 points per game and helping his team win the gold medal. Suggs scored 15 points, his best mark in the tournament, in the final against Mali.