2 week old barred rocks...possible hens or roos?

[PDXJULES]

Hi, Have you confirmed Gender yet? I have 2 who look the same at 2.5 wks. Both VERY spunky and rowdy. They are getting large, and one repeatedly trampled and stood on the runt of my little flock yesterday (a dark backed Exchequer Leghorn) then others came to peck her. I separated her, fed scrambled eggs, and kept her warm, and she slept well, but died last night. The Barred Rock and 5 remaining chicks shd be females, but I dunno. I'd sure like to winnow out any Cockerels.