Is this baby coming from a breeder? If so, the breeder should tell you what had happened to this baby's tail, whether it was from an injury or was born that way. Either case, I highly doubt you can 'fix it', unless an x-ray can reveal if it was a break and they'd be able to reset it.
If you're getting him/her from a pet store, be sure to inspect him/her for any other possible injuries or joint disfigurements. You may want to reconsider, unless you will be able to care for what may come in his/her later years.
If the tail's the only issue, I am certain that s/he will be just fine.