Took the words out of my mouth. Could you post a photo of the buff silkie, facing the camera, with her crest held back so I can see the extent of her comb. Silkies are generally very difficult to sex before 4-5 mos. of age or older.
Because your black is beardless it's easy to see he has wattles at this age.
Drumstick diva I'am currently out of town and have somebody Waching and caring for my chickens. Therefore I can't post a picture of her for at least 2 weeks. But I will post a picture as soon as I get back to my house. I'am currently visiting family. Thank you