It just occurred to me that you said the bird was only two weeks old. Unless they've eaten the feces of a bird with worms or been exposed to dirt, bugs, or vermin they don't have worms.
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One of my quails does this constant head, beak open motion/shaking its head like they do when they're drinking water. But it's doing it ALL the time... it will break for a quick nap, but almost all of its waking moment is spent doing that... I also haven't heard it peep for about a week. It's only 1.5 weeks old, is it choking?