My duck had been sitting on eggs. They hatched about 7 days ago. There is 5 babies and 1 has a leg problem. It can't walk very well. It has what it looks to be is a band that wraps around his leg and looks like it ataches to his baody. He hatched with this. It is on the leg with a problem. I don't know what to do. The band is black. That leg as well is not growing and the other is so he is very lopsided. can u help? I need some answers ASAP. he is getting worse.