Since it's a good, low-fat source of protein and other nutrients, seafood is an important part of a balanced diet for pregnant women. But some fish have high levels of mercury that can harm an unborn child's developing nervous system.
That's why pregnant women should eat no more than 12 ounces of cooked fish per week.
A typical serving of fish is three to six ounces; that's around two to four servings a week.
If you eat more than 12 ounces one week, cut back on seafood the next week or two.
Pregnant women, nursing mothers and young children should not eat these large fish; they contain extra high levels of mercury: