According to a very small study, maternal ingestion of a low FODMAP diet reduced crying in colicy babies who were breastfed. This report was presented at the recent United European Gastroenterology meeting (P0609). The study consisted of a single-blind, open-label study of 18 infants. The key finding was reduced crying from 142 minutes to 90 minutes over the 2 week study period.
A summary of this report is available at gastroendonews.com (May 2016, pg 8).
My take: A bigger study is needed to ascertain whether this intervention is worthwhile. Many kids get better during a 2 week period without treatment.