Hi Eagles Ring,
Your new kittens are adorable!
Below is a link I would encourage you to take a look at. It allows you to swab you kittens' mouths, send in the swabs, and have them tested for the genetic mutation for cardiomyopathy that is fairly common in Ragdolls. Or, ideally, the breeder you bought them from has already done this and both parents are negative, which would mean your kittens are negative, as well.
Why would you want to do this? Well, it's very common in Ragdolls (the figure I learned is 30%, but that could have changed) and you could return a pos/pos kitten that will likely die from heart failure sometime in the potentially near future to save yourself the heartache and expense, or, you would know that the chances of you cat eventually developing hypertrophic cardiomyopathy are very high and then have him/her checked at routine intervals, as medical care started early in the process (prior to the clinical signs of heart failure that would alert you to the problem) can improve the quality/quantity of your cat's life. Or, you could go to the breeder and demand part of the money you paid for them back to help with possible future medical expenses, as responsible ragdoll breeders should be testing for this particular mutation.
Note, a negative test doesn't mean your kittens won't ever develop a cardiomyopathy, but it does mean they won't develop the one by this particular genetic mutation, which is responsible for the bulk of cardiomyopathies in Ragdolls.
I would guess you might already know about this, so forgive me if it's duplicative. And if you didn't, sorry about giving you potentially bad news. I own a doberman, who has a 60% chance of dying from a heritable cardiomyopathy.....and there is only one genetic mutation test available, though there are at least one or two more prominent mutations out there that can't be tested for in dobermans yet. So from where I sit, the Ragdoll breed's risk is greatly preferable!
Wendy
http://www.cvm.ncsu.edu/vhc/csds/vcgl/ragdoll-faq.html