Yellow thing in chicks mouth?

[Paddyl]

there is a small hole on the top of one of my eggs in the incubator. I can see the chicks beak and there appears to be something yellow in its mouth or between the top and bottom of the beak. Does anyone know what that could be. I try to take photos but it’s too blurry.

 

[mandymcg05]

there is a small hole on the top of one of my eggs in the incubator. I can see the chicks beak and there appears to be something yellow in its mouth or between the top and bottom of the beak. Does anyone know what that could be. I try to take photos but it’s too blurry.

Some leftover yolk sac maybe??

 

[Amylynn007]

Could it be its egg tooth?

 

[Paddyl]

Could it be its egg tooth?

Nah it’s a bit longer