You will never get enough food in him with a syringe. I can't imagine what your doctors were thinking. He needs about 9 cans of Ensure daily to just maintain, and you'll never do that with a syringe. The bag drip is adjustable so that it can go as slow or fast as you want, plus give you the volume of food that he needs. Please check into this as soon as possible, it sounds like no one on your doctors end of things orginally got you the right equiment or taught you how to use it. They dropped the ball on you here.