My two pullets are about 10 weeks old and I thought they were old enough to go in with the hens. One of them has an eye injury and has blood on her beak. I removed both the pullets from the older hens and treated the injury. I will have to wait until morning to see how she is. All the other hens are about the same age. When is a good age to put pullets in with hens? Do I wait until they are the same size as the hens?