Going Quackers -
I have sometimes had foot issue with my baby ducks (I hatch many many every spring and summer), and honestly, I have had them simply out grow it pretty often. I believe its got something to do with where the leg ended up in the egg. I remember very specifically Pekings having this more than Khakis do. I suppose out of 10, 7 are getting around ok by the first month. Three became dinner ducks, when they couldn't get around at all. (you know how fat pekings get)
You might try moving the leg front and back a bit every day, to keep it from fusing that way. That's all I ever did. Good luck.
I have a girl who struggles, but as long as she can get in and out of the duck house and the pool, we're going to let her keep on keepin' on.
Clumsy Pekin:
Clumsy injured herself a few months ago and this leg kept getting stuck back on top of her tail:
