It looks like the skin around his tummy/rear and sort of toward his leg is filled with a clear fluid. He is as lively as can be and is just dragging it all around the incubator. I have put him into an empty incubator with a placemat on the bottom to keep him from snagging the sac. I am hoping it will absorb by itself. Anyone else had this happen? What was the outcome? Thanks! Patches I'll go take a picture and post in a minute.