Mercury in fish, why is it bad for your baby?

Toxic to nervous sys. Mercury can be toxic to the nervous system, . Especially an undeveloped, immature one. Good idea to limit intake. Cdc has recommendations re: amounts and types of fish that are ok. In general, little fish like sardines, herring, mackeral are ok. Big fish, like halibut albacore tuna, grouper, king mackeral should be avoided while pregnant.