Cherwill, Ducks don't normally fall over unless there is some hatching problem. It is usually only a matter of drying and they are up running eating and drinking on their own. I would contact the hatchery and ask for a replacement or credit. Make sure you get him warmed up well, and that he gets some food and water. If he won't eat and drink drop some sugar water or pedialite in his beak slowly. Make sure he swallows so he doesn't drown. You might be able to pull him out of it. Ducks are much heartier than chickens and recover better. I've used a hair dryer set on low before for emergency warmings if you don't have an incubator to warm him in.