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It will look like a pufferfish and can't stand up. Your chick looks like it just has a bit of bubble butt and hasn't absorbed all of the egg yolk yet.

They can sometimes fill up with air but I don't think yours is to the point that you need to deflate it yet. If/when it happens you just use a hypodermic needle to let the air out. It might take a couple of times for it to stop filling up with air but it will.