from yahoobreastfeedingreflux
what’s the connection between gas and reflux?
Gas is created when something isn’t digested properly; for example,
beans are generally harder to digest than other foods, which is why
they are notorious for causing gas in most people (they are generally
not a common problem with breastfed babies through mom’s milk, though;
this is just a common example to help make sense.)
Also, gas puts pressure on the esophageal sphincter (the muscle at the
top of the stomach that helps move and keep things down), making it
easier for whatever is in the stomach to be refluxed.