What sex are these silkies?

[bobbi16]

Does anyone know what sex my new silkies are? My guess is that the buff ones are all roosters and one of the white ones is a rooster and the other white one is the only hen? am i right? one white one is crowing (so that one is obvious) and the others are not crowing.

 

[bobbi16]

they are about 2 1/2 months old by the way

 

[redguinea]

All roosters except for the one white pullet. Some closer pics of the combs would help confirm.