I don't know a lot about guessing sex- it's all still a guess for me. At 3 weeks though, the little wattles on chick # 1 seem boyishly red and developed. I can't see chick # 2 well enough to see if they are approximately the same size and redness. I also do not know if coloring determines sex. So, I haven't been much help here, but you do have cute shicks!