I'll definitely post pictures of this chick and our four others at six weeks for genders. We started with three chicks, which are around three weeks as well at this point. Then we ended up with another from Atwoods because my mom thought it was a Silkie and really wants one. Turns out it's more likely a Sultan, but still a cutie. Not sure on the age on that one, but it looks to be possibly older than three weeks because it has quite a few more feathers than the others. 
Yeah, the one with four toes on one foot and five on the other is a Silkie and D'uccle mix. The one missing half a toe is a Mille Fleur D'uccle. 
I named the chick, which will hopefully be a pullet, Melody. She can be quite loud and makes this cute little trilling sound every now and then.