Thanks for your responses!
I held off on cloth when it was possibly yeast, as I didn't want to worry about reinfecting him. Really the only time he's in a diaper is overnight (and we usually have 2-3 changes), and if we're out and about, so not really able to have more air time.
I cut out tomatoes and citrus since I posted this, and not a ton of improvement. We backtracked though on Monday when he was in a diaper for a longer period of time (we drove over an hour to see my midwife, so there and back, and then had to right away go over to our new house for the inspection) so even though I had him in 100% cotton clothing, and Honest diapers, he got bad heat rash, which just aggravated everything. We've been doing baking soda baths twice a day. Making sure he is super dry, and no ointment, only time we do powder (bentonite clay) is when he has a diaper on so that way he isn't hot and clammy. So kinda doing the "plain" part. Been doing more active rinsing with my peri bottle for changes and patting with cloth wipes that have been soaked in water.
I'd be shocked if it were yeast, and I totally understand about it being treated systemically. I've upped my probiotic, and I'm seeing how it goes if it is something on my part with my gut that he's getting through breastmilk, and seeing how that goes. I have a baby probiotic for him that I can give him, too. I haven't had antibiotics for years, and have been actively trying to heal my gut for the past two years. He didn't have any antibiotics either.
Our laundry detergent is homemade, just oxyclean, washing soda, and borax. We have an "old fashioned" top loader washer, and I wash all his clothes on hot with an extra rinse.
how did you know your son had a zinc allergy? What were his symptoms? Just curious since my son's rash seemed to get worse with the use of the high zinc butt paste.
I had my midwife look too and she was super puzzled as well. He has his 2 month check up on the 11th, so I'm hoping his ped will have some insight...
Thanks again for your responses and thoughts! Appreciate the support