I have two chicks. 18 days old. They are chirping, pooping, eating and drinking. Tonight I noticed that their chest looks really large on one side. (Both of them). I’m new to this. What could it be? They are eating medicated crumble and I did add some grit in the pen. They have sand in there that they bath in. I’m using shavings. They are in a large play pen They have food, water, shavings, sand and the brooder. It is soft to the touch. I did not push hard but I felt it and its soft to the touch. What should I do?? I’m kind of freaking out. I hatched them myself from a friends flock. They are salmon Favorelles if that matters. I need all the advice. THanks in advance!!!