Hi Nikki,
Some baby WB caiques have alot of black and others don't. I have seen some babies that are nearly all the orange and I am guessing that it depends on the parents. (???)
Have you seen your baby? I would ask for pictures. You can definitely tell by the white on the belly - as babies have alot of the yellowish feathers rather than the pure bright white. Go look at Gloria's picture at
www.shadypines.com. She has a basket full of babies and it will help to give you an idea.
As for age - they all are a little different but most of it molts out about 6 months I think. My little Sassyfras is 8 now and gets a little black spot somtimes and I think it is adorable. It makes her very unique - I call her my little ladybug.
I wouldn't think the breeder would have you wait if she is trying to sell a little older bird. Who is the breeder? When I got Sassy and Punkin from North Carolina - I spoke many times with the breeder and he sent me pictures of the birds with his wife and in their little cage and one with them in a little bowl on the table. (That is how they kept them in one place while feeding because they are just so busy and of course starving and running around).