Hi and welcome to YT
! Your baby is just adorable.
Yeah, there are many very unscrupulous breeders who try to invent things like "mini yorkies" and then charge you more for it. There is no such thing as a mini, micro, or teacup yorkie -- so I'd steer away from anyone who used such terms to try to "sell" you a trait like that - it's just a sign of greed in the end, really.