These chicks are 5 weeks old. They were hatched from a batch of eggs I bought as "Polish Bantam", all the eggs were small and white. I'm wondering though if there was a mix of bantam and full size genes in the mix? Is that even possible of do I just have a couple of runts? I have two chicks the size of the small one and three the size of the large one. The small ones are also feathering up a bit slower than the rest.