WATCH the EFL Championship LIVE on beIN SPORTS | Sign up to take advantage of our 7-day FREE TRIAL here | AU | NZ

The hosts had not scored in league defeats to Leicester City and Stoke City, having also crashed out of the Carabao Cup at the hands of third-tier Port Vale since their most recent win almost a month ago.

Swansea, meanwhile, was looking to use its last-gasp 3-2 cup victory over Nottingham Forest in the Carabao Cup in midweek as a springboard.

The visitors thought they had done just that when Zan Vipotnik opened the scoring, only for the strike to be disallowed for offside in the first half.

But Birmingham amassed a staggering 23 shots, and its goalmouth pressure eventually paid in the fourth minute of stoppage-time, when substitutes Lyndon Dykes and Patrick Roberts combined, with the former heading in a dramatic winner to get its season back on track.

The crushing defeat sees Swansea's seven-match unbeaten run in all competitions come to an end. 

It now trails Birmingham, which is just outside the play-off spots, by two points.