As a 16-year-old Milano won a bronze medal with Team USA at the 2013 World U-17 Hockey Challenge, and as a 17-year-old he helped the USA squad capture the gold medal at the 2014 IIHF World U18 Championships. Milano recorded 2 goals and 2 assists at the 2015 World Junior Championships. Milano was part of the bronze medal-winning USA U20 squad at the 2016 World Junior Ice Hockey Championships.