It is a double substitution for Birmingham.

Jonathan Leko and George Hall are on for Juninho Bacuna and Alfie Chang.

There is more movement in the Birmingham dugout, looks like Jonathan Leko is about to come on for the visitors.

Troy Deeney makes way for Birmingham and is replaced by Lukas Jutkiewicz.

The temperature continues to climb in Cardiff and we're having the second half's drinks break now.

A big 20 minutes ahead for both sides.

Jordan James is booked for cynically pulling back Callum O'Dowda as Cardiff looked to counter-attack.

There is lots of time left in this game, and if Birmingham continue to dominate as they are currently you sense a goal is not far away.

Michael Pearlman
BBC Sport Wales at the Cardiff City Stadium

I've had some fun with Jason Perry, but no doubt Cardiff are deservedly ahead.

However, they have dominated this game and only lead 1-0.

That has encouraged Birmingham, who are enjoying their best spell of the match.

You do feel there is another goal in this game.

That is the end of Jalen Philogene's first league start for the Bluebirds, and as things stand his goal is the difference.

Romaine Sawyers' afternoon is also over.

Cardiff youngster Rubin Colwill and summer signing Kion Etete are on in their place.

Both sets of players grab a quick drink while Jalen Philogene is down receiving treatment.

It does not look too serious, but Rubin Colwill is getting ready on the touchline so we may see a change.

Jason Perry
Former Cardiff defender on BBC Radio Wales

Birmingham are in charge of this second half, they've closed the space and made it tighter so Cardiff are struggling.

Michael Pearlman
BBC Sport Wales at the Cardiff City Stadium

Ok Jason Perry, you want some hyperbole do you?

Juninho Bacuna just took the worst corner I've ever seen in real life.

In 34 years of going to football.

Now that's a big and justified statement.

For the first time in the match the momentum seems to be slightly pointing in Birmingham's favour.

They haven't created anything of note, but they are having far more of the ball then they were in the first half.

I do not want to be dramatic, but that corner from Juninho Bacuna may be the worst I have ever seen live.

Josh Williams is immediately involved down the Birmingham right.

His cross is diverted behind and the visitors have their first corner of the match.

Birmingham are making their first change of the afternoon, Josh Williams is on for Mark Roberts.

Scott Hogan and Cedric Kipre get into a race for a long ball and the Birmingham striker goes down inside the area.

The travelling fans think referee Darren Bond has pointed for a penalty but the decision is a goal-kick.

Hogan is unhappy with the decision and is booked for his protests.

It looked soft from here, not sure there was enough contact from Kipre.

Substitute Mark Harris controls a lovely lofted ball from Ryan Wintle before playing Callum O'Dowda into the Birmingham area, but once again the Republic of Ireland international's shot is blocked.

Cardiff are immediately on the front foot once again.

Jaden Philogene is first to burst into the Birmingham box before Andy Rinomhota pulls a ball back to Callum O'Dowda, but his shot is blocked by a number of red shirts.

Romaine Sawyers gets the second half under way.

Cardiff have made one change, Mark Harris is on for Max Watters up top.

Cardiff have been dominant and the statistics back that up.

As well as having 63% possession, the Bluebirds have also had 11 shots to Birmingham's one.

Six of those Cardiff efforts have been on target while the visitors are yet to test Ryan Allsop.

Image source, BBC Sport