According to the American Pregnancy Association, FDA guidelines state that pregnant women can safely eat two 6-ounce servings of calamari a week. Squid is not considered a high-risk food for pregnant women because it is low in mercury, unlike some other seafood.
Mercury is often found in fish and other seafood. High levels of mercury can pose a serious risk to children and to pregnant women. The fish highest in mercury content include marlin, shark, king mackerel, and swordfish. These should be avoided entirely, according to the American Pregnancy Association. Other fish is safe to eat in moderation, but pregnant women should not consume over three 6-ounce servings a month of Chilean sea bass, bluefish, grouper, and Spanish or Gulf mackerel. Tuna is high, sometimes very high, in mercury content and consumption should be limited or avoided. Calamari can be eaten twice a week, as can clam, crab, oysters and shrimp.