January marks National Birth Defects Prevention Month, and this year’s theme is “Best For You. Best For Baby.” The Centers for Disease Control and Prevention (CDC) estimates that 1 in 33 babies born in the United States are born with a birth defect. The CDC also reports that birth defects are the leading cause of infant deaths, accounting for 20% of all infant deaths. The causes of most birth defects are unknown. However, there are some things you can do to increase your health during pregnancy.