I have 3 bantam chicks, approximately 6 weeks old. Two of them are blonder and smaller, whilst one has a slightly bigger tail, and is also larger in size, as well as duller and darker in colour. Because of its size, we would presume that she/he would be the cockerel. However, as they grow up, the other two have developed combs as well as gills on their chins. Unfortunately, we are coming to believe that these two may be the boys. They also often fly at each other. The two smaller ones seem pretty tame, with one falling asleep when cuddled. I have attached a picture from a few weeks ago. Will update soon with a more recent pic.