What is the youngest age I will be able to tell? I have some 11 week old Buff Cochin Bantams, sex was pretty obvious even when I got them at around 7 weeks..... Have 9 black frizzles that will be 5 weeks Monday....Two have reddish combs already. What do you think? Too young to tell or ? Chick 1 And Chick 2 Also have 4 Silver Spangled Hamburgs, 2 have distinctly more reddish combs coming in. Is this usually a good sign its a roo in chicks this age?