It's really tough to be able to tell what they might mature into when they are chicks. All should be crested whether they have vaults or not (depending on how they are bred the crests may be smaller or larger). In the past I heard a lot of people saying the vaulted chicks would have bigger crests. With good breeding the non vaulted can have crests just as large though. I actually prefer the non vaulted as the vaulted ones have much less skull protecting their brains and can be more injury prone. I have found in my own stock the females are more likely to be vaulted than the males.
Seeing how the parents crests are can give you a little insight to how the chicks crests might turn out.
Silkies do come in bearded and non bearded and you can tell pretty well from how they look as chicks if they will have a beard or not. They'll have cute puffy little cheeks if they are going to be bearded. If you don't have any non bearded or partially bearded parents than all the chicks should have beards.
If you cross a bearded with a non bearded the offspring will get partial beards. If you cross partially bearded birds you can get bearded, partially bearded, and non bearded offspring. Non bearded to non bearded should give you all non bearded offspring.
Here is a non bearded chick. Hopefully you can see there isn't much fluff under the chin or on the cheeks.
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Here is a vaulted and bearded chick (this one is especially puffy)
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And here is a non vaulted bearded chick.
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