Breastfed 2 week old

Shannon
My sweet little man already has a semi bad diaper rash. He poops like 5 or 6 times a day. Maybe even 8. It's not a whole bunch at one time and it tends to come every time he passes gas. It's the right color, yellow, somewhat runny, not completely though. We don't know if it's something I am eating or of its his wipes we are using. I prefer pampers sensitive, but got a whole bunch of Huggies wipes for baby shower & was using them first. Need advise. I've read breastmilk rubbed on his rash & air dried is great for healing. Plus I've tried butt paste & Burts bees diaper rash creme. Neither of which are keeping him from getting redder or irritated. It just centered around his anus, not on his entire bum. Considering calling his pedi & having him checked. What would you do? Any advise from other moms & breastfed mom's greatly appreciated!