[header] How to help prevent ovarian cancer [title] Reduce your risk with your reproductive choices. [step] Although scientists aren't sure why, you can reduce your risk for ovarian cancer by making certain choices about having children and controlling your fertility. [substeps] You can reduce your risk for ovarian cancer by having at least one baby. 
Studies show that the more pregnancies you have, the more you can reduce your risk. You can also reduce your risk by using birth control pills (containing both estrogen and progesterone) for at least five years.