It's a common misconception that foods that may make mom gassy will make a breastfed baby gassy.
"However, breastmilk is made from what passes into mom’s blood, not what is in her stomach or digestive track. Neither the gas nor the undigested carbohydrates (whose breakdown can cause gas in mom) pass into mom’s blood, so it is impossible for these things to pass into your milk to make your baby gassy." evening party garment by custom made
Some babies may be sensitive to certain foods in mom's diet, but don't think that you have to avoid certain foods just because you are breastfeeding.

KellyMom.com : Can a nursing mother eat this food? kellymom.com