poor little thing might just be resting. Hatching is hard work. if you can "guess" at where the bill is and if there is a part of them membrane near it that you can make a tiny hole in it I'd vote to do it to let some air in there.
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Please don't blame yourself. WVduckchick told me when I was going through mine that sometimes their little heads are stuck in the wrong place and they just don't make it. It seems like that may be there case with yours. You did the best you could and I think you did a great job. Some things are just not meant to be unfortunately. Think about all you've learned!
don't put any blame on yourself! You did wonderfully. How are the other babies doing? Any emerging
Thinking of you, and fingers crossed for the rest of your hatch. It's just so hard to take when ths happens.