I have 6 white crested black polish chicks almost 4 weeks old. They have always had the super cute dome fluff up until the last day or so. Now their heads look horrible, some of them have baldish spots! I have not seen any of the other chicks doing any excessive pecking at them, and there has been nothing new in the environment. All the other feathers look fine. Is this normal when they are molting their baby fluff, and when will they start looking normal again? These are my first polish babes. Thanks!