And it was two summer signings that got the goals for Lee Clark's men.
The Blues took the lead after 12 minutes thanks to Matt Green, who was left unmarked to head in a Shane Ferguson corner.
Former Birmingham manager Steve Bruce did have something to shout about after 75 minutes when Paul Robinson brought down Sone Aluko in the area. Birmingham Academy graduate Aluko took the penalty himself, sending Darren Randolph the wrong way, but Blues held on.
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- Andrew Shinnie