The most common response you're going to get is to just keep practicing and stretching those fingers. One exercise I try is to play a simple 1234 pattern with your fingers, then skip the pinky out to 1235, then 1236. Just mix up different stretching patterns and you'll get some more reach. Unfortunately the length of your fingers is something you're stuck with. I don't have freakishly short fingers, but they definitely aren't long, and I lose a lot of playability on the neck because of it. Kinda sucks.