Hey guys. we recently hatched some ducklings and for the past week have had 7 healthy, very rambunctious ducklings with no issues. They are just over a week now and we let them swim all the time for a few minutes. Today the rest got out of the baby pool by themselves and started to wonder but one continued to swim. I helped it out of the water and now it can't stand or walk. It tries to but ends up kind of crawling around. It breaks my heart. She was fine upon putting her in the water. I got some niacin as I see no physical injuries. Any ideas?