While you’re breastfeeding you’ll be passing on a lot of nutrients to your baby, so your diet during breastfeeding can make a difference. Getting plenty of good foods in your diet during this time will make sure you’re getting the nourishment you need.
If you’re worried your baby is reacting to something in your diet while breastfeeding, the best thing to do is avoid that food for a few days to see if they improve. Be careful not to cut out whole food groups (like dairy or wheat) without chatting to your health professional first.
On the other hand your diet can also expose your baby to a variety of interesting tastes. You never know what they could be developing a love for in those very early stages.