A good start is waterfowl starter crumbles for the first two or three weeks, slowly switching over to a duck grower feed. But those are not always available.
At four weeks, I would start them with some grower feed, and a poultry vitamin mix once a week. You can feed them worms - I brought...
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Have you been able to hold her and carefully examine her foot and leg and the top of the leg with eyes and hands? Any extra warmth? She may have the beginnings of bumblefoot, may be something else.
In any case, I would give her Epsom salts compresses on the foot and leg twice a...