Hi I have 6 ducks that are 4 weeks old today and they dont have any feathers! I plan on showing them at my state fair, which is august 9th. Will they be fully feathered by then? I have 1 male and 1 female black Swedish, I male and I female welsh harlequins, and 2 male Pekins. Will the welsh harlequin male have his green head and matures feathers? Thanks!!