Hi. I just got 4 sweet baby girls the other day. They are all healthy and spunky. Yesterday I noticed one of the ducklings wasn't moving much. I picked her up and put her down and she immediately laid down. She's eating and drinking just fine. I give them niacin with their food, and the other 3 are acting just fine. I noticed later in the day she could stand up but was favoring her left leg. Sure enough I saw her her hobbling around to get to the food and water. I'm not sure what to do. I don't thinks it's broken. She folds it in like normal but sometimes she also leaves it untucked a bit. It's not overly warm and at the moment appears to look normal. Any suggestions? Thank you in advance.