article_snippet.sent: However, some fish and shellfish contain higher levels of mercury that could harm an unborn baby or young child's developing nervous system.
article_snippet.sent: That's why young children and women planning to have a baby or who are already pregnant or breastfeeding are advised to avoid fish that can have higher levels of mercury, such as shark, swordfish and marlin.
article_snippet.sent: Pregnant women are advised to limit Pregnant women tuna to no more than two steaks or four medium-sized cans a week.