For me, the little chick ended up getting better. I doubted disease b/c all the eggs came from my own flock. (I'd have more than one ill.) The labored breathing calmed a bit when I held it, but returned as soon as I put it back. I tried dipping the beak in water & massaging the crop. (no change) I thought it would die, but it was alive & in the same condition by the morning. I made some electrolyte mix & gave some via eye dropper. The rest went into the brooder's water. A few hours later I noticed the chick breathing normally. So far, the symptoms have not returned. Tomorrow's the one week birthday, so perhaps it was just underdeveloped.