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I did not notice the light brownish duckling before. Assuming that mom is really a blue Swedish then dad would have to have sex-linked brown. That baby would then be a sex-linked duckling and be female. I recently hatched some ducklings like that from my Silver Swedish female and half Khaki...

As already stated, you may have a few early quackers. Otherwise, I think you have a better chance of a female if you choose a small one with small feet.