That mothers who drink cow milk can cause colics in their babies is well known.

Sage tea can best be avoided during breastfeeding as well as artichoke; this may also be well known.

Less known may be that healthy vegetables like broccoli, cauliflower and brussels sprouts and soy products may also not be tolerated by babies when these are eaten by mothers.

A question of trying out and seeing what is true for your baby.

Remarkable that garlic is often good for breastfeeding in small amounts[This goes against the Gemara probably]

All a fact of trial and error.