[header] How to buy a pet corn snake [title] Learn to differentiate between an adult corn snake and a newborn. [step] A newborn will simply be smaller than an older one. It's important to ask whoever you purchase your corn snake from the snake's age. 
There are pros and cons to each side-a newborn can't breed and is more fragile, however can be trained to be friendlier and easily eat frozen mice. An adult, on the other hand, can breed, is less fragile, but may have issues eating frozen mice.