Under pressure Stoke City manager Nathan Jones saw his side beaten 2-1 at Birmingham.
He made six changes from the midweek cup at Leeds.
Goalkeeper Adam Federici, Liam Lindsay, Joe Allen, James McClean, Peter Etebo and Lee Gregory were drafted in.
Jack Butland, Cameron Carter-Vickers, Bruno Martins Indi, Ryan Woods, Sam Vokes and Tyrese Campbell made way.
In a first half of few chances, Lee Gregory had Stoke's best opportunity but he was denied by goalkeeper Lee Camp.
In the second half, the visitors stepped up a gear, Gregory again went close but this time he saw hit the post as he burst into the area.
Stoke did eventually take the lead on 58 minutes when Tommy Smith's superb free kick was headed in at the far post by defender Liam Lindsay.
But the visitors hit back with two goals in three minutes to seal victory.
First, Lukas Jutkiewicz headed home at the far post and then 16-year-old substitute Jude Bellingham saw his shot from well outside the area deflect in off defender Lindsay and wrong-footing goalkeeper Adam Federici.
The result leaves Stoke at the bottom of the Championship table heading into the international break.
Stoke are back in action on September 14 when they entertain Bristol City.