So I have some Cornish Cross that are about 7 weeks old. One of the females is about half of the size of the others. This wouldn't be a problem but she also seems to be having a problem putting weight on her legs. She stands briefly and then staggers backwards. She mostly sits on her bottom with her legs splayed out in a V. I have put a waterer in there that she can reach since I was worried she was getting dehydrated. Our other waterers are buckets with nipples on the bottom. She seems able to reach the food when the other birds let her. I don't know if it is related or not but her legs seem to be reddish between the toes. What should I do?