Fish
It builds up: that is why it is avoided entirely
A freshwater predator: it builds up mercury, which can harm the baby's nervous system. Avoid it during pregnancy.
Limit while breastfeeding: mercury can pass into breast milk. Prefer low-mercury fish (salmon, sardines, sole).
General information, not medical advice. It follows the public guidance for pregnancy and breastfeeding, and it cannot know your own history: for anything about your health or your baby's, the person to ask is your midwife or doctor.
the label, before the doubt
mamma&me