your acidity will not pass to the child.. but as you are having gas   talk to your doctor.. don't self medicate as you are breastfeeding.. have plenty of fluids and green leafy veggies.. eat balanced diet..

Try putting a cold pack (wrap ice in a towel) and place on your lower abdomen before going to bed. This has worked wonders including problems like bloating. You need to cool your body down. Skip tea/coffee and spicy/thick gravy foods completely. Eat lots of salads in meals (2 bowls of salad for 1 bowl of sabji). In this weather, drink coconut water in morning and evening. (not before and after meals)

you recently have c section and I think you should take your doctor's advice on this issue.... try light food and frequent small meals, take lemon water, coconut water, ajwain water in daily meals... drink ajwain water daily to avoid gas for you and your acidity will not go to your baby it's myth

take lite food like moong dal khichdi dalia. make sure u r eating fresh made food