What Is A Good Meal For A Breastfeeding Mommy As To Not Make The Baby Gassy?

My sister in law brought her first baby home today. I volunteered to cook a meal for them.
I want to find a nice meal that she can enjoy and not make the baby gassy. My sister in law is breastfeeding my nephew.
Any good meal ideas that my brother in law and sister in law can enjoy?
Thanks for your help!