There are not many things in this world that could convince a breastfeeding mama to give up her precious caffeine. Between the daytime demands of motherhood and the middle of the night feedings, most mothers I know (myself included) would rather part with the hair on their head than with their beloved morning coffee.
https://www.romper.com/p/can-caffeine-cause-infant-reflux-heres-what-eliminating-it-can-do-for-your-baby-8339457
Can Caffeine Cause Infant Reflux? Here's What Eliminating It Can Do For Your Baby