Some breeders choose to incubate the eggs in an incubator to ensure all the fertilized eggs will hatch. Yet some people who dont have incubators let mother nature take its course. A female ball python will stay on her eggs untill they hatch. They wont eat or even drink water for the entire gestation period of 60 days. Then once the eggs hatch the hatchlings stay atached to the yoke fo a while and absorb all its nutrients. Then they are on their own. They will shed with in 10 days and have their first meal shortly after that. Pretty efficiant i say. Maybe this is why they have survived for millions of years.