Blues were condemned to just their second away defeat of 2013 at Ipswich Town.
The visitors rarely threatened Ipswich’s goal throughout the afternoon, while the Tractor Boys were very much a threat.
Ipswich were out of sight by the time Daryl Murphy made it 3-0 on 57 minutes, with Birmingham not able to respond – apart from Chris Burke’s late consolation.
The catalyst for this comprehensive loss was a terrible start for Blues in Suffolk; falling behind on six minutes after allowing Carlos Edwards too much space.
Jack Butland was forced to tip over Murphy’s near post header three minutes earlier, but the Stoke City-bound ‘keeper had no chance with Edwards’ arrowed drive from the right hand edge of the box.
The visitors thought they’d levelled shortly afterwards when Nikola Zigic nodded in Ravel Morrison’s flick on, but the Serbian’s effort was chalked off for offside.
And Ipswich quickly doubled their advantage on 17 minutes, with Luke Chambers left in acres of space to head home Aaron Cresswell’s free-kick from six-yards out.
Wade Elliott’s misplaced back pass could have led to a third for the hosts, but Butland cleared the danger as an alert Frank Nouble was bearing down on him.
Birmingham’s second and final attempt on goal in the first-half arrived moments later, although Redmond’s free-kick sailed high and wide of the Ipswich goal.
The Tractor Boys still looked the more likely to score next and Nouble went close with a strike from the edge of the area, that flew past Butland’s right post.
Then on the stroke of half-time, Nouble was flagged offside after prodding home Murphy’s parried shot.
Things didn’t get much better for Blues after the break but they did show a little more urgency – at least.
The game was well and truly out of sight for Lee Clark’s men when Murphy drilled the ball into the bottom corner on the turn, after Nouble’s deflected shot had worked its way to the Irishman.
Clark introduced Morgaro Gomis and Burke for Mullins and Elliott on the hour mark, but this did little to galvanise Blues.
In truth, the Portman Road outfit could have netted a fourth if Tabb had got on the end of Murphy’s delivery across the face of goal.
With 25 minutes left to play and Ipswich happy to move into cruise control, Birmingham were only able to manage a series of Redmond shots on goal – that was until Burke grabbed a 90th minute consolation by guiding the ball through the legs of Scott Loach.