Hi there I have some 10week ok chickens I'm trying to sex, I have my thoughts but I'm no expert! Not the best pics it's pooring here (hench the temp coop). The rain has helped my opinion if the silkies as I can actuall see wattles!
bottom photo lower silkie on left, looks very macho - one behind him on left looks pullet - one to the right I'm leaning towards roo but kind of iffy. With silkies I think the girls tend to have narrower, flatter combs
the picture above shows a BOY silkie in the left bottom
I did read some where about sexing them just hatched buy there combs, female smooth oval/male figure 8 bumpy. I did do this and had 1/2 1/2, but lost one at a few days and then lost track as they grew :/