For one get the ducklings on something besides the slick floor. This looks very similar to a seizure. So possibly holding the duck securely wrapped in a hand towel might help it not to be so severe. Poor little one needs some Liquid B complex. We can't stress enough how important B complex is to them not just having strong legs but overall health. And for some reason some ducklings just can't get it out of their feed properly even when it is made for waterfowl. So get this little one on the B complex to start. is it eating well? you want to make sure he gets a full dose of the b complex so either putting it over a small amount of mealworms or directly into the bill would be best. if he is eating good then putting it over a small treat is better than trying to give it into the mouth with such a small duckling.
This will give you info on the liquid B complex and also dose for its age.
https://www.backyardchickens.com/threads/niacin-deficiency-in-waterfowl.1367557/
Don't give up on the little one.
This will give you info on the liquid B complex and also dose for its age.
https://www.backyardchickens.com/threads/niacin-deficiency-in-waterfowl.1367557/
Don't give up on the little one.