This case involves the newborn of a thirty-year-old woman with bipolar disorder. For three years, the woman had been under the care of a psychiatrist for her bipolar disorder. The woman’s psychiatric condition was being treated with lithium, a mood stabilizer. She was not told not to get pregnant while on lithium. The woman was a late registrant during pregnancy, who established care when she was twenty-two weeks gestation. Her gynecologist was concerned that she continued taking her lithium during pregnancy. Inspection of the fetal heart during prenatal testing revealed a potential defect. The woman stated that she still wanted to continue with the pregnancy. The woman was referred to another psychiatrist who prescribed her a different mood stabilizer for her bipolar disorder. After the child was delivered, she had a positive S3 and S4 heart sound, systolic ejection murmur, and showed evidence of heart hypertrophy. An echocardiogram was performed which revealed the diagnosis of Ebstein’s anomaly. The child required immediate therapy with numerous pharmacological agents. Later in childhood, the child required surgery to correct her heart condition because the heart could not tolerate strenuous physical activity.