breastfeeding advice/help

Mommy
I'm 3 months pregnant with my third child. I was really young when I had my older two sons. I breastfed both of them the first few weeks of life but didn't have any breastfeeding support or advice back then. Both of my sons had super sensitive tummies and one had colic and had to go on nutramigen formula. This time around I really want to know any ins and outs what foods to avoid that might irritate babies tummy. My mom didn't breastfeed and either did my grandmother. What lists of food should I avoid since I tend to have babies with sensitive tummies