Spit up question

So almost 2 months ago our pediatrician recommended me going dairy free in order to help with my son’s spitting up issue. Now, while we have seen a big change in the amount he spits up and how often he spits up it is not 100% cleared up. Could there be something else in my diet that could be causing this? I am considering going gluten free to see if that makes a difference, or at least talking to his pediatrician about it. Has anyone had their children have a gluten issue and see a lot of spitting up in their infant?