"In addition to folic acid during pregnancy, a woman needs more iron than a nonpregnant woman; actually, about double," says Trolice. "This helps a woman make more blood to carry oxygen to the baby." The daily amount needed (27 mg) can be achieved pretty easily. Foods high in iron include lean red meat, poultry, fish, dried beans and peas, iron-fortified cereals, and prune juice, he says.