Sorry if this is a silly question, but I was wondering if the chicks with darker brown or black little bumpy things above their beaks (assuming it's the comb or w/e you call it coming in)are most likely girls. When can I tell the difference? They are 3 and 1/2 weeks old. I have 2 golden sebrights, silver laced polish, 2 BRs(can BRs have feathered feet?), wyandotte (chipmunk looking chick) and a frizzle.