Leeds United come away from Brentford with a commendable point, while Nottingham Forest suffered a shock home defeat.
After Leeds United lost on Saturday, West Brom beat Millwall 2-0 to go four points clear at the top of the Championship.
Just three points separate the top five in the Championship after promotion-chasing Fulham, Brentford and Nottingham Forest secured wins.
After gifting their opponents an early goal, Birmingham City hit back to record a seventh win in their past nine trips to Ashton Gate.
Wigan Athletic enjoyed another trip to Elland Road on Saturday, beating Leeds United to give West Brom the chance to go top.
Manchester United got Odion Ighalo on loan, West Ham spent big on Jarrod Bowen and Marko Pjaca left Juventus on deadline day.
West Ham left it late to complete one of the biggest deals of deadline day, signing Hull City's in-demand forward Jarrod Bowen.
Wayne Rooney's Derby County halted Stoke City's four-game unbeaten run in the Championship with another home win.
Antonee Robinson will not be joining Milan after the Rossoneri ran out of time for additional medical tests on Friday.
Leeds sit at the top of the table after a hectic night in the Championship, which saw Wayne Rooney score his first goal for Derby.