Help baby chicke n

I volunteer at a place that has baby chicks, and the main bird volunteer is out of town and one of the babies is not doing well. This morning I found it on the bottom of the container with all the other baby chicks and it looked like it was dead, but it was moving a little so I gave it some egg yolk and Pedialyte mixed in a dropper and held it near the heater (not too close!) alternating betweeen heating it and heating it, for about 90 minutes. It had a lump on its chest, which I just learned is a crop. I had to leave for a while but is there anything I can try to purchase? I usually foster puppies and have lots of experience with sick puppies but none with birds. Please be kind - I am not knowledgeable but willing to read or learn to help until tomorrow when bird person comes back.