Besides the four types of fish to avoid, there are no other foods you should avoid while you're breastfeeding. Eating a wide variety of foods while you're breastfeeding actually introduces your baby to more tastes. This makes it more likely he will accept a wider variety of foods at an older age.
Sometimes you might find your baby seems to have a reaction to something you eat. If your baby seems fussy or colicky after you eat a certain food, just avoid it for a few days or a few weeks. Most babies outgrow these sensitivities quickly.
If baby continues to be fussy/colicky when you eat a certain food, he might be having an allergic reaction. This happens more frequently in families with a history of allergies (including food, inhaled and contact allergies). Dairy food is the most common food allergy in babies. If you suspect your baby might be having this reaction, stop drinking milk and eating other dairy foods for 2-3 days to see if that stops the problem. If it doesn't help, see a breastfeeding counselor for help about what to do next.