I bought 22 EE chicks 7 weeks ago and I'm having a hard time telling the difference between the sex of the chicks. Some of them have almost no comb, some of them have a bit more comb that is just light pink, some of them have a larger comb that is almost red, some of them have almost no comb that is red, I have to say I'm confused! How do I tell the difference or do I just have to wait and see?