I think my daughter went through maybe two outfits a day. I nursed and she rarely spit up... but idk if that is from nursing or a coincidence. What she did do was blow out her diapers everyday, it would go up her back every time she went. That called for the outfit change and a lot of time and oxi clean! I did return a lot too. I didn't end up putting her in outfits that were dark colored or silly things like jeans... she was so fair skinned it just looked really silly and took away from her. If people give you goofy stuff you will never use may as well return it.
I would wait and hold on to it. Clothing is expensive
Between spit up or maybe leaky diapers, my kids went through a couple outfits a day...thinking about it my daughter went through more since she spit up a lot.
It's always a good idea to have a lot of extra.