"This nutrient is a major factor in thyroid hormones and also increases fairly substantially during pregnancy, to a daily recommend intake of 220 mg per day," says Shaw. "If one does not consume adequate iodine, your baby's physical and mental development can significantly be impacted," she warns. It's not always the most common nutrient to find. "If you're one to use speciality salts like smoked sea salt over iodized table salt, be sure you're eating seafood or dairy products on the regular, which are also great sources of iodine," she adds.