we are seeing some redness in Sage's creases that the coconut oil didn't seem to be doing anything for. one of our helpers suggested the all-natural version of Boudroux's Butt Paste (green bottle). we are alternating that one with a different ointment from The Honest Company, one that includes beeswax, because the butt paste is quite heavy. DF originally didn't want to use any Zinc but has come around due to the recommendation from extended family. if yours is not due to a food allergy, it might be worth looking around for different products just to see if they work any better for you.
Yeah, this, unfortunately. You might consider giving him a probiotic to help. Either get capsules you can open to give enough powder that covers your pinky finger, or get a small bottle of powder. Rockwell nutrition carries one, and I open Bio kult capsules to give to Silas.
A cream will help as a barrier while you figure all that out though. I also like Weleda a lot, and this is similar. I buy it from Azure Standard for about $2 less than amazon, very very simple ingredients.