Buff Orp looks male and the other I don't know about, can't clearly see its crest at any angle. Right now I'm leaning towards female. But I could of course be wrong about both. Best wishes.
The Buff could be a rooster but also could be a hen, the Silkie I think is a hen. The buff Orp has little waddle growth which is a sign of hen at her/his age. at 6 weeks a rooster would have a vissible start of their waddles.