I'm no expert, but the longer your chicken's comb stays fleshy colored, the better. I have seen some posts of chickens at 5 weeks old that had obvious red combs. So far yours is looking pulletish to me. Good luck. I am sitting on the roo/pullet fence with an 8 week old Marans. It's driving me crazy not knowing what it is. I don't want a roo! But, I hate thinking about having to give it up! Only time will tell.