Duckling limping

[daisychickiemama]

I came home this afternoon and one of my new ducklings is limping… anyone have any advice? I was able to pick it up and I couldn’t see anything obviously wrong with the leg. But clearly it’s hurting. They are 12 days old. Any advice welcome! Thank you in advance. I have attempted to attach a video through Pinterest, about 10 seconds in it’s very obvious which one is limping

https://pin.it/5NAI3gVWQ
Limping Duckling