Chelsea’s star double act Sam Kerr and Fran Kirby came off the bench to fire Emma Hayes’ side into the semi-finals of the FA Cup.
The Women’s Super League champions toiled in the first half and missed a penalty through Beth England.
But Kerr made an immediate impact with a neat header and then Kirby scored twice in two minutes before Pernille Harder sealed victory.
Chelsea will now face Manchester City in the last four.
Hayes made eight changes from the team that thrashed Manchester United 6-1 on Sunday and they looked toothless early on.
England spurned a golden chance when she blazed her spot-kick over the bar midway through the first half.
But, when the reinforcements were summoned, they responded in clinical fashion.
Kerr and Kirby have nine goals between them already this season as Chelsea seek to win their first FA Cup since 2016.
They face Gareth Taylor’s City in the last four for the fifth time in seven years, which Hayes could hardly believe after being told of the draw at full-time.
“No way. Did we get Manchester City again?” Hayes asked. “I can’t believe that. Who draws the hat? It has to be Arsenal. Amazing.
“I don’t care where it is or who it is because we’re in the semi-final. I can’t wait.”
‘Things going against us’
Birmingham boss Scott Booth said it was an “excellent” performance from his side, but admitted Chelsea’s “big guns made the difference”.
“We can take a lot of things out of the game,” he added.
“It doesn’t feel like a 4-0 again. Things are going against us at the moment. It came down to a few individual errors and when you make errors against quality they will make them cost you.”
Line-ups
B’ham City Women
Formation 4-3-3
- 1Hourihan
- 14FinnSubstituted forScottat 80′minutes
- 4Quinn
- 30Lawley
- 25Holloway
- 11Pennock
- 8Robertson
- 19Whipp
- 22Ryan-DoyleSubstituted forCowieat 86′minutes
- 7Often
- 23Whelan
Substitutes
- 3Scott
- 21Ramsey
- 32Cowie
- 34Phillips
Chelsea Women
Formation 3-4-3
- 1Musovic
- 4Bright
- 7Carter
- 3nouwen
- 29FoxSubstituted forCharlesat 66′minutes
- 24SpenceSubstituted forHarderat 66′minutes
- 5IngleSubstituted forKerrat 45′minutes
- 25Andersson
- 22Cuthbert
- 9EnglandSubstituted forKirbyat 66′minutes
- 17Fleming
Substitutes
- 8Leupolz
- 11ride
- 14Kirby
- 16Eriksson
- 20Kerr
- 21Charles
- 23Harder
- 28Telford
Live Text
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Match ends, Birmingham City Women 0, Chelsea Women 4.
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Second Half ends, Birmingham City Women 0, Chelsea Women 4.
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Goal! Birmingham City Women 0, Chelsea Women 4. Pernille Harder (Chelsea Women) header from the centre of the box to the bottom right corner. Assisted by Jonna Andersson with a cross.
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Attempt missed. Erin Cuthbert (Chelsea Women) right footed shot from the right side of the box misses to the left. Assisted by Jonna Andersson following a corner.
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Corner, Chelsea Women. Conceded by Gemma Lawley.
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Attempt blocked. Pernille Harder (Chelsea Women) left footed shot from outside the box is blocked. Assisted by Jessie Fleming.
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Jonna Andersson (Chelsea Women) wins a free kick on the left wing.
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Foul by Abbie Cowie (Birmingham City Women).
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Substitution, Birmingham City Women. Abbie Cowie replaces Eleanor Ryan-Doyle.
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Offside, Chelsea Women. Sam Kerr tries a through ball, but Pernille Harder is caught offside.
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Attempt missed. Aniek Nouwen (Chelsea Women) right footed shot from outside the box is high and wide to the right. Assisted by Niamh Charles.
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Fran Kirby (Chelsea Women) wins a free kick in the attacking half.
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Foul by Harriet Scott (Birmingham City Women).
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Attempt missed. Louise Quinn (Birmingham City Women) header from the centre of the box is high and wide to the right. Assisted by Veatriki Sarri with a cross following a corner.
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Corner, Birmingham City Women. Conceded by Jessica Carter.
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Substitution, Birmingham City Women. Harriet Scott replaces Jamie Finn.
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Corner, Chelsea Women. Conceded by Rebecca Holloway.
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Attempt missed. Sam Kerr (Chelsea Women) header from the centre of the box misses to the right. Assisted by Fran Kirby.
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Foul by Niamh Charles (Chelsea Women).
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Rebecca Holloway (Birmingham City Women) wins a free kick in the defensive half.