I have a clutch coming out at the moment, two babies out their eggs, three still in.

I checked on them and one of the babies was half out of the egg. It went back in a bit when I lifted the lid on the egg box. I checked a bit later and the baby just has it's head and about 2" of it's neck/body out of the egg.

However, I can see a large blob of yolk in the egg, about half the size of a plum, maybe a little bigger and it looks like the umbilical cord or something is constricting the middle part of the yolk, wrapped around it and slightly tightened. I hope that makes sense?

I didn't want to investigate too much as didn't want to disturb the baby too much. I'm assuming there's nothing I can do, but has anyone had this and is there any chance the baby will be OK?