Reagor, he's young yet, and some take a long time to develop the comb and wattles. But if you can keep him and aren't too worried about attachment to him, do so until you can be sure. I've had them well over 6 months before you could tell for certain.
Notice the difference in the two Robin put on for you. They are older than yours, I'm sure, but you can tell a lot about posture, as well as the fact that the pullet's crest is more rounded and comes down pretty low toward her beak, while the roo's has the streamers in back. Pullets do not have streamers. Robin's cockerel has a nicely rounded crest, somewhat unusual in males. He's also non bearded, which makes his wattles show up more than in a bearded.
Edited by BetsyOK - 8/19/12 at 6:03am