question: my grandson is 6 yrs old and has cerebral palsy. He is having excessive amounts of foamy saliva. He has a G-tube, a partial fundoplication, and is having Albuterol treatments and wears a vibration vest. He currently is fed a liquid Nutren and supplemented with baby food and yogurt by G-tube. He also has popsicles by mouth and some pudding. What can be causing this?