Hen Mother Gagging?

[ChikinInThePines]

hey everyone! My button Quail recently had 6 babies and she started doing this “regurgitating/open mouth” thing. I added some chick grit to their crumbles. Any idea on what this is? I’ve been reading about sour crop and different things. Video in Link.
Hen Gagging

 

[micstrachan]

I am sorry I am unable to help you. I think the crop is a good place to start. Good luck! FYI, I can’t see the video.