You can see in the last pic by six to seven weeks old you can start to tell the sex. The one on the far right is starting to get the white stripe running up the side of his head just behind the eye. The hens will have no stripe and start getting a white ring around the eye.
How do those come about ive seen them on your website and i was kinda interested in them oh and i wanted to ask but do you need a federal permit for color variated birds that are native such as silver woodies or silver bahama pins
Yes you do need permits for color mutations. The mutations do happen even with wild birds I can't recall which book but I have seen the blonde widgeon in a book and the picture was of a group of wild widgeons with one blonde in the group. When this happens with captive birds they are bred back to birds that carry the gene and when bred together they through the mutated color.