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Even when an egg isn't incubating, the air cell slowly grows as the egg ages. Hot temperatures, a thin, porous egg shell and some other factors can cause the air cell to grow faster than normal. Hopefully the duckling will hatch successfully, even though it will be smaller than its siblings...

I don't think there is anything you can do other than let it keep developing and hope for the best. Did you happen to candle the egg Before Newt began incubating it? It's possible it was a much older egg than the others, and that is why the air cell is larger. I am going to tag @Miss Lydia to...

I don't know the answer to your specific question, but I wanted to tell you congratulations on the fertile eggs and broody Newt, and I hope she has a great hatch rate!