The Mr moved the chick into the small incubator while I cleaned up a flood I had caused in the laundry room so it was away from the other active chicks. I had a good look and it is the yolk sac that had broken which caused bleeding plus I can see some intestines. I have had small yolk remaining but nothing like this. I think it would be better for me to cull than risk me attempting to help it and just cause more damage and prolong it's suffering