My daughter did this as well at 8 mo old, and for a bit I just tried to feed her as many healthy finger foods as possible and make up for it in nursing. Then my grandmother came and showed me a wonderful trick--get a toy that makes noise and has lights and fits on the highchair--something cheap because it will get dirty, hard plastic so you can wipe it down. It worked wonders. I was finally able to spoonfeed her again, I just let her play with the toy (it was a circus bear that made the toy sing and light up when you rocked him, and had the big beads on wires that she could push back and forth above his head) and she didn't even pay attention to what I was doing.