Like you I am still new to the Backyard chicken life and each day is a new learning process. When I got my 10 week old chicks there different sizes and colors. I got two Australorps, two Brahmas and two Wyandottes and for the beginning months I watch them grow at different rates. Sometimes I thought for sure I had a rooster in the bunch, but as each day went by I learned to be patient to see what would happen. I really would like to help you more, but I an not an expert chicken person and you are posting under new member introduction, so introduce your self. Post some more pic and someone with better skills than I can help you.