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Because fatty fish can contain toxins like mercury, the U.S. Food and Drug Administration and Environmental Protection Agency caution children age 12 or younger against eating albacore or white tuna, shark, swordfish, king mackerel and tilefish. Children should be limited to two child-size servings a week of any other type of fish or shellfish, and to less than one ounce of canned light tuna per week for every 12 pounds of body weight. A child-size serving is 1 ounce of fish for 1- and 2-year-olds; 1.5 ounces for children ages 3 to 6; and 2 ounces for a child over age 6.
