how soon can i release ducklings
3. Allow adult ducks to swim unassisted. When ducklings are fully feathered with their waterproof, adult feathers, they can swim without your supervision. Depending on the type of duck, full feathers should be in place by 9-12 weeks of age.. Allow adult ducks to swim unassisted. When ducklings are fully feathered with their waterproof, adult feathers, they can swim without your supervision. Depending on the type of duck, full feathers should be in place by 9-12 weeks of age.