Sex of baby corn snake?

The simplest technique to sex your snake is to examine the tail of your snake, after the vent. On male snakes, there will be larger bulges due to the hemipenis, creating a larger tail than on a female. On a female snake, her tail will immediately be tapered after the vent.

If I have to guess, it is most likely a male.  Females generally have a tail that tapers sharply from the base to the tip. Also most breeders will only sell female snakes as part of a pair. Single snakes that are sold are usually males. There are metal probes that allow a snake to be sexed, or an experienced snake person can squeeze the tail and push out the hemipenises. Both method can result in damage if not done correctly. 

The mail usually has a longer tail after the vent that you're showing everybody there the female has a very short tail after the vent that you're showing everybody there.

My guess is that you're holding a male snake

ask a vet or at a petstore

someone at a pet store might know or a vet