Comb color and size compared to the other bird of the same age...your little pullet has a small comb that's still yellow, whereas your cockerel's combs and wattles are larger and nicely red. That's not always a complete indicator, depending upon the breed and how fast they mature. The males also had the beginnings of little cock feathers in their tails...a little darker set of feathers that are starting to show curve. I also saw a few saddle feathers in there...those are pointed feathers in the area right in front of the tail. One of them even has a little green feather going on...when they all get bigger you'll really start to see these secondary characteristics showing up more strongly.what did you look at to determine male or female? sorry im new at this
They aren't a very large breed, so they seem appropriately sized for the breed. As long as they are healthy and perky acting, they should do fine.thank you so much!! yes they are sussex chickens and we take them to fair on friday, yikes!! Im not sure they will place because they are so small. Poor little ones are 8 weeks old and haven't grown much at all.