My black sexlink chicks are about 3 to 4 weeks old. These are my first batch and I am granted frieking out. They have fully devoloped wing feathers and are starting to them on the backs and heads. Their getting bald under their wings. Is this normal? I mean some of them are exctremely bald. Is this a sign of mights or am I frieking out for no reason? Sorry I have no pics I don't get how to put them on here. Thanks!