There is no evidence to show birth defects are more common in pregnant women with anxiety versus those who do not have anxiety. One of the most common questions people ask is whether or not anxiety can cause birth defects. This question is understandable, but the answer is no. There has been no evidence to show that birth defects are more common in pregnant women with anxiety versus those who do not have anxiety. You can rest easy knowing that your pregnancy will be just as safe and healthy as any other pregnant woman's pregnancy.