It's 10-11 weeks. I have 4 chicks all around the same age, but all different breeds. I brought them all home together and after about a month the silkie stopped coming over to get treats with the others, runs off when it sees me coming when all the others run to greet me, and is the only one I see fighting with the others.
Thanks everyone! This one's name is Mulan because I knew from the start there was something suspicious about it. I guess I can wait another month, but it really seems to be pestering the others. However, I do see them sleeping together just fine. This is my first flock so do I isolate the silkie?