Yaya, what do you mean by spitting reflex? Do you mean spitting up, or do you mean that your lo is spitting food back out again? If you mean spitting back out again, then it sounds to me like he hasn't lost the reflex yet that makes them spit back out things that get in their mouth. That wasn't very articulate I know but I can't think of the right words right now.
But, root vegetables are excellent for babies with reflux. Carrots, sweet potato, white potato, that sort of thing.