Okay, now we need to see a photo of momma duck.
Your baby looks like a "buff", but that would require both of the parents to have donated a recessive "dusky" gene, which may not show in either parent, since it is recessive.
And a blue-dilution gene, which your Saxony has, but would also show up in the mom if she had it.
And a sex-linked brown dilution gene, which could have come from the Saxony, where it could have been a hidden recessive gene. Or if it came from momma duck it would have shown in her coloring.
So...... any photos of mom?