I am new to chickens, and brand new to silkies. We have three one week olds. One is black, the other is yellow with white feathers coming in.....the third is yellow but has darker feathers coming in...more like a dark grey. I thought it would be a white bird since it was pure yellow when we got it....the dark feathers have sort of surprised me! Any idea how it might turn out? Maybe white and grey? Also, I know silkies are super hard to sex...but anything I can look out for that might give me an idea? They are only a week old but the black one and the grey/yellow one are already chest bumping.