In many mottled birds color comes in with adult feathers at 3-5 months. It can intensify after each adult molt. So you need to wait for the spots.
If you knew they weren't mottled you should of mentioned that in the first post.I know technically they aren't mottled, but I believe they follow the same pattern for developing color as mottled birds, so that's why I called it that. If they don't, than I learned something new.
I don't see the point in mentioning mottled if you knew they werent. That's just confusing the OP or others that would see this thread later.
They don't follow the same pattern for developing color at all like a mottled bird.
Mottled birds are hatched with a lot of black. Mostly black on top and white on bottom. They then evolve into black birds with the white feather tips or splotches.
These birds have about zero in common with that. And that's very noticeable from the pics. There's no waiting for the spots because there's going to be no spots on the white ones.