babies should NEVER EVER be kept on sand as a substrate. They will sometimes injest it, and can become impacted. Remove the sand immediately. Its true that you dont need white (U.V) light since they are nocturnal. After you removed the sand, hand feed it some yogurt or baby food, and some mashed mealworms and crickets.
PS-theres a leopard gecko forum on kingsnake, so check it out.