David, while I don't necessarily agree that all babies are not hardy, those found on dealer tables at most show are not hardy babies. I don't even consider selling animals less than 6 months old and with a minimum of 15-20 meals. Unless it's going to someone I know really has the experience with chondros, I usually don't sell anything under a year of age. By this time they are solid feeders on adult mice and you have a better idea of what stresses them, if anything, and what their temperments are like. I think once a breeder gets around 10 meals in a hatchling, they are fairly hardy by that time.
Brandon