It could be the formula! are there other formulas covered by WIC?
Maybe he needs sensitive enfamil and wic can change it to an enfamil that works.
Don't let people tell you seed oils are bad, it's a very misinformed understanding. But it can be the type of formula that needs changing if he has sensitivities, reach out to your pediatrician or the WIC office for an evaluation. Or as you are pumping he could be having sensitivities to a food you're eating that needs to be cut out.
@Jenny no that’s the only brand unfortunately
I wouldn't worry about it my son was on enfamil his entire life because I couldn't get any other kind and I also couldn't breastfeed and he's just fine he's actually extremely healthy