My youngest bad chronic reflux issues and I saw a chiro for her from about 4 weeks old. He was extremely gentle and it seemed very effective. I'd notice the immediate impact it had on her and how settled she would become after the session. If we missed a week I noticed how unsettled she became again until I was able to get her back.
We stopped at about 6 months old.
I know the risks with chiros, and it's not something I've ever used for myself, but I definitely felt it helped her (and therefore me).
I know that chiros get a bad rap, and often deservedly so, but for whatever reason I think for the right conditions they can be very effective.