I had one 2 years ago that had me worried. It was basically flat. That egg had a very thin and almost translucent shell. It had dimpled so much that I wondered how the baby had any room in there but like usual, that clutch (8 eggs) began to pip at 54-55 days and I cut them all. That baby was normal size and fine.
I imagine it was glad to be out of that cramped egg though!
I'm not sure why mine always pip so early compared to some others but I've never had a clutch go the full 60 days. Not from any female. I incubate in a large igloo cooler with bulbs mounted inside PVC pipe drilled full of large holes which snakes in a figure 8 from one end to the other. A computer fan mounted behind each bulb to push the heat throughout. Then an additional fan in the center to keep heat even in the incubator. All below a raised grate that my sealed egg boxes sit on which are set up with substrateless method to keep humidity close to 100%. Temp maintained at 98 degrees using a herpstat. It's a fairly controlled environment and I've never had any fluctuations. I replace fans and bulbs seasonly and they are very inexpensive.
Maybe this has something to do with my early pippers.
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