classical music, even in utero, not only after birth, which was highly touted recently and so on. so they would do many things. now as far as i'm concerned, there's no evidence that this has a direct impact on the baby's brain. but if you think logically, if the mother relaxes when she listens to mozart and her pulse rate slows down and her entire circulatory system and body is less stressed, this can only be healthy for the baby. doctor: the baby's heartbeat sounds great. it sounds calm right now. there's data now to show that women who have stress have a greater risk of having a baby that has an anomaly of either the heart or the central nervous system, like spina bifida, heart abnormalities that are more likely to occur in a woman who has stress. and then also there's been a study showing that women who have stress are more likely to have a miscarriage. so this really focuses us toward the early part of pregnancy. researchers are also studying how acute stressors like domestic violence and natural disasters affect pregnancy. calvin john hobel: recently our team showed a relatio