I have 5 Pekin Ducks that are around 7 weeks old. For awhile one of them has had a little limp but she’s been fine. Then about 3 days ago her legs started getting worse and now today she can hardly walk. I’ve made sure to add niacin to their food and b complex to their water. I also checked her legs and nothing seems to be visibly wrong. I have no clue what to do for her at this point. Her stomach is also pretty much bald. If just has the spines of her feathers. This might be from her laying down in the wet all the time because she can’t stand. Does anyone have any ideas of what’s wrong or what I can do?