That is heartbreaking. 

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I'm sorry for your loss, @Dees ducksI'd treat this immediately..keep them dry & warm & give niacin (water soluble vitamin b supplements) & electrolytes. Don't worry, poultry cannot overdose on vitamin b as the excess will transfer to waste & the more electrolyte ingested right away the better.
Last duckling died yesterday afternoon. I'm so so so devastated, upset, heartbroken and angry in equal measures. I only had the 5 ducklings 24 days but they were already part of the family and I loved each and every one.