These are 3 week old poults and 2 out of 4 have developed this problem were one leg is turned 90 degrees side ways and the knee seams to be swollen it bends in toward the body and they waddle like a duck. I have starter feed and water 24/7 in the cage. we started them with hardware cloth over newspaper since they were brought home at 3 days old. One started about a week ago and the other today. I noticed they do not get around as much as the other two. Can anyone help us with this problem? How do I include a pic?