The Yorkshire side dominated the game and took a first-half lead before adding two more goals after the break. Two of their three goals came directly from free kicks.
Blues Academy coach Steve Spooner admitted it was a below-par showing from his players.
"It was a disappointing performance and probably the worst we’d played since we came back from pre-season," he said.
"In the first 20 minutes we played some nice football but never got in behind them enough and really the game went downhill from there. They were physically stronger than us and out-battled and outworked us which was very disappointing.
"They deserved their result because of the way they went about their work - they were industrious and competitive, which are all the things that we should have had with our football.
"It was difficult to pick out any positives, other than to say we were good the week before and you get that with young players, and we have to move on from it."
Blues U18s: Callum Preston, Reece Hales, Bobby Moseley, Reece Brown (Foday Nabay, 5), Romario Redley (Josh Cogley, 45), Nat Kelly, Viv Solomon (Fisayo Adarabioyo, 61), Charlee Adams, Deqwon Ebanks, Liam Truslove, Demari Gray.