If you do a search on "baby doll Persian kittens", you will find a bunch of sites advertising "baby doll faced" Persian kittens, and "tea cup" kittens. Silver Persians are typically smaller than other Persians. Many of the reputable silver breeders state on their sites that there is no such thing as a "tea cup" cat. "Miniature", "standard" and "teacup" are NOT Persian classifications. Doll faced is also not a correct term. "Chinchilla" and "shaded" are the correct designations.
Here's a site which gives Persian standards:
http://www.wyndcreste.com/persianstandard.shtml
If you deal with a breeder who is talking about "baby doll faced" and "tea cups", they are probably running a cat mill. The reputable breeders who breed to improve the silver lines (by breeding their grand champion cats to other grand champions) will never use those terms. Unfortunately, because they are relatively expensive cats, some people start indiscriminate breeding of pet quality cats for the $$$. Most reputable breeders won't sell a pet quality cat unless the cat is spayed or neutered. Sometimes they won't issue the pedigree papers until there is proof of neutering/spaying.
I find silver Persians to be exquisitely beautiful. I've been negotiating for six months to get a quality silver kitten, and the breeder has finally agreed to let me have one of her kittens. It is highly doubtful that any silver breeder that advertises "teacups/doll faced Persians" will have dams and sires that are grand champions. They may have a champion or two, but that will probably be all. The fact that they make up their own standards should raise red flags.
There are three quality levels--show, breeder and pet quality. Pet quality cats should never be bred. Stay away from the kitten mills--they literally charge as much or more for their inferior cats as a reputable breeder will for a pet quality cat.