Why does everyone tells me that i should not eat chocolate because i am breastfeeding, baby is 3 weeks. why not?

Let me explain: Some babies are sensitive to certain foods in a nursing mother's diet. And since food allergies can run in families, it makes sense to avoid foods that you or the baby's father are allergic to. But there is no evidence that all babies react poorly to certain foods. Each baby is different, and a food that bothers one may not bother another.