birth defect - a physical or chemical difference that a baby is born with, mercury - a chemical element, third trimester - the period between the seventh and ninth month of the pregnancy, second trimester - the period between the fourth and sixth month of the pregnancy, food poisoning - an illness of the stomach caused by poorly prepared, cooked, or stored food, folic acid - an important vitamin during the early stages of pregnancy, whole grains - grains such as rice, wheat and oats, which are eaten unprocessed, calcium-rich foods - food that has a high level of calcium,

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