please need help

[jeramyv8]

i have a 3-4 week old ducks and one of them just started walking on it's knees plz help me i'm so worried and dont know what to do plz help me

 

[howfunkyisurchicken]

What are you feeding them? Ducks require niacin, and without it, they usually develop leg problems...

 

[jeramyv8]

duck food from tractor supply and giving them tap water to drink but it's only the 1 duck that seems to have this issue