While it’s true that what goes into your body does make its way into your milk supply, the amount is generally a tiny fraction of what you ingest. Gas and fussiness in your baby are the most common signs that something you ate has made its way into your breast milk.

Common culprits include cabbage, onion, garlic, broccoli, Brussels sprouts, cauliflower, peppers, eggs, wheat, corn, fish, peanuts, nuts and soy. Chocolate and citrus fruits, as well as cow products like milk, cheese, yogurt and even butter can also be common culprits. Diarrhea and skin rash could signal a reaction.

If you notice these symptoms in your baby, try eliminating the food or foods you suspect might be the culprit to see if doing so helps.