I agree, I don't know anything that reduces it either. But at least it isn't excessive spit up! One of my daughters was CONSTANTLY spitting up, and I would go through bib after bib, constant shirt changes. The only thing I can really mention is...keep lots of bibs on you! I also had some of those bibs with the vinyl backs on the, which helped a lot, it prevented the spit up from seeping through to her shirt. See if you can find some of those. And for a rash... not sure if this will help? But you might want to look into it...the same daughter had a horrible diaper rash at one point, all she could do was scream and cry, and I stumbled upon Calendula, which we got from the health section of the grocery store. It is a lotion/ointment made from some plant to help with rashes. I put that stuff on my daughter before she went to bed(as nothing else was helping), and that horrible rash was gone by morning. But my other daughter, that stuff doesn't do a darn thing for her? Might be worth a try for his rashes he gets. Good luck!
K.