Gender specific feathers don't come in until at least 12 weeks of age. For young chicks look for the combs and wattles to get red and large on males. It usually takes until 4-6 weeks old to tell, sometimes longer.Would my chicks behavior along with her not having tail feathers (I can feel them just cant see them yet,while my other chick alr has them) possibly be a sign to a rooster?