Steve Spooner’s young charges found themselves 2-0 down within the first half-hour, before midfielder Charlee Adams pulled a goal back for his side with a well-struck shot.
But with Blues pushing for an equaliser they conceded a crucial third goal just before half-time and then another two in the second half.
Whilst he was naturally disappointed to see his side ship five goals, Academy coach Spooner was pleased with some of his side’s attacking play.
“It was a heavy defeat, but ironically at one stage we could have been 3-1 up had we not missed several good chances,” he said.
“With the game at 2-1 we conceded a third goal late in the first half which changed the complexion of the game.
“We weren’t constructive enough going forward after the break and were too desperate.
“Defensively we were a bit sloppy which was disappointing because several of the goals we conceded came from set-plays and crosses from wide areas.
“That’s not to say it was solely the defenders’ fault, because defending starts from the front.
“I was fairly happy with our forward play and but it goes without saying you can’t concede so many goals and win games.
“Barnsley deserved to win, but it could have been a 10-5 game to them with the amount of chances both teams created.”
Blues U18s: Callum Preston, Josh Cogley, Dominic Bernard, Foday Nabay Fisayo Adarabioyo, 80), Kyle Rowley, Nat Kelly, Deqwon Ebanks (Viv Solomon, 55), Charlee Adams (Ishmael Seremba, 58), Reece Hales, Liam Truslove, George O’Neil.
Subs not used; Peter Denton, Bobby Moseley.
Goals: Charlee Adams (30).