"If you chase the team above you are more likely to win more games".
Albert Adomah scored his 13th goal of the season on the hour mark and Conor Hourihane netted a second after 81 minutes as Villa moved one point above Derby in the race for automatic promotion to the Premier League.
Jedinak was the only change for Villa, who were searching for their seventh-straight league win - what would be their best streak in 28 years.
The 57-year-old Villa manager had until Saturday been on compassionate leave following the death of his father last Tuesday, the pain of that experience compounded by fears for his mother, who has herself been battling serious illness.
Canor Hourihane made it 2-0 with 9 minutes left to play as the home side snatched valuable points to keep their second position on the table.
The first half finished goalless but Birmingham came within a whisker of opening the scoring three minutes before the break.
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