Try bottle feeding him. Enlarge the hole in the nipple so milk will run out without having to suck on it. This will allow him to practice sucking and swallowing without having to work too hard at it. Put the nipple in his mouth and hold mouth shut so he has to swallow. Pour a little and stop, pour a little and stop, etc. Keep in mind this will be a slow and messy process. May take a few days too. The light bulb will eventually click on. It has for ours anyway. Good Luck.