United youngsters slipped to a heavy defeat against table toppers Charlton Athletic at Sparrows Lane on Saturday.
Addicks striker Ademola Lookman was the star for the hosts netting a second-half hat-trick after Regan Cook had cancelled out Kler Heh's early opener for the Blades.
United opened the scoring in just the 9th minute, HEH outpaced his marker and slotted past goalkeeper Dimitar Mitov from Eastwood's long punt down field.
The Blades controlled much of the opening 45 minutes, but the home side equalised against the run of play on the stroke of half-time, when COOK took full advantage of a fumble from Eastwood to restore parity from close-range.
Following the restart, Charlton grabbed the game by the scruff of the neck and LOOKMAN got his first just after the hour, drilling home a powerful effort after United failed to clear a loose ball.
Moments later LOOKMAN got his second and his team's third, latching on to Aaron Barnes's through ball before lashing home with his left foot.
The Blades chief tormentor LOOKMAN secured the matchball in injury time, side stepping his marker before coolly slotting the ball into the bottom corner, giving Eastwood no chance.
Blades: Eastwood, Sullivan, Semple, Hallam (Ishmail 61), Evans, Cheeseman (Hutchinson 77), Heh (Wright 66), Calvert-Lewin, Cockerline, Hinchliffe, Kedman.
Unused: Ramsdale, Portman.