Gnarled Carrots
In the Brooder
Wheezing can also be a sign that their vents are clogged. I had this happen to a chick once. I freaked out and called a very expensive vet, just to figure out that I needed to pour a small amount of saline through her nostril to clear the dust. After a couple weeks, when she got a little bigger, she was perfectly fine again. Although that doesn't sound like what you're dealing with, it can be a problem with young chicks.