I quarantine new animals for a full 12 months. If I'm going to breed them, I can breed the quarantined animals to each other during that time, but they won't go in with the rest of my collection until a year is up. Too much risk, otherwise.
Normal babies get sold. I sell some of them locally, some are shipped, and some go wholesale. People who want a pet are generally looking for normals, and I have had no problem selling out of them, either.