We have 30 new chicks of many different breeds & all seem very healthy & are growing quickly except the two Black Sumatras. They are still very small compared to the others and one seems just fine, but the other has a large bald spot on its haunches just before the tail and its gotten worse over the past few days. All the other chicks are getting new feathers and none of the others have this problem...does anyone know what might be causing this? I watch over them all the time & I don't notice any of the others pecking at them. Also, a few days after we got them that same chick seemed out of sorts & seemed to have trouble standing up straight but that went away & she eats & drinks just as much as the others....any ideas or suggestions?