Sounds like a typical duckling, glad to hear it's doing so good. It's feet turn in? Are you supplementing with any kind of niacin? are you feeding duck or chick starter. Leg problems like lameness or bowed legs feet turning in can be from a niacin deficiency so if they are on chick crum then I'd supplement with a good form of niacin. Nutritional yeast or B complex liquid or plain niacin [not flush free or time released] Can you post some recent pics it's been a few days since we've seen them all. Is the lil one able to walk and run normal now?