Finches keeping their mouth open?

[Geronemo3]

Hi,
I recently changed the cage of my baby finches as it was getting crowded in their old cage.
They are right now 9 weeks old.
I've noticed that one of them keeps her mouth open every now and than for a few seconds.
Does anyone know what that means?
Are they hungry, scared or angry? (defense mechanism?)
There is food and water already in the cage.

Thanks.

[EyesofFreedom]

If they are sitting normal and just have their mouths open a little it can be a sign of stress...

[Lisa]

Finches will do this when they are overheated or scared out of their minds. It sounds like one of them is very nervous with you being so close by.

[Geronemo3]

Thanks guys.

I will try to give them more space.