Being a smart butt..I so wanted to say..if it has a genitalia it's a boy and if not it's a girl....sorry first thing that went through my mind when I saw your thread.
Be sure to take them to the vet for a well check...if you are going to hve them neutered many vets will do a pre-op exam..be sure to have a fecal done...if your newbaby has any parisites you want to get that taken care of. Neutered males not only smell less they are less aggresive and seem to bond easier.