J.H.
I am a speech-language pathologist who used to work in EI. Hopefully you have either an OT or SLP working with your son. Sometimes I would try letting kids play with food on their tray, make things with it...with no pressure to try it. Eventually you can encourage him to "kiss the food good-bye" just as a low pressure way to get it towards his lips. Start with one or two foods to play with as to not overwhelm him. It can be a slow process but try not to let it become a battle of wills. Eating should be fun for everyone. Hope this helps a little.