I know these guys or gals are young but it's still fun guessing! I will give you a little information about each to see if you think it's a cockeral or pullet. Both were the same size when I got them and they should be 4 weeks old this weekend. On the left is "Baby" My runt! Seems to have a darker colored comb with some red in it but has the smaller waddles and over all is smaller of the two. Also it is feathering in slower? On the right is "Onyx" Is bigger and it's comb is alot whiter but the waddles are bigger and have more pink in them. It has more feathers?