New signings Arnau Puigmal and Largie Ramazani are named.
Three 15-year-olds are in Man Utd's squad for the tournament.
Goals from Brandon Williams and Millen Baars gave United a deserved victory in front of over 2,200 people.
A late strike from Tyrell Hamilton won the game for Birmingham.
Despite conceding first, Kieran McKenna's Manchester United under-17 side finished comfortable winners in Slovakia in front of a good crowd.