The nuMoM2b Heart Health Study is a prospective observational study that includes interval contacts and a detailed cardiovascular assessment 2 to 3½ years after delivery of the index pregnancy. At the cardiovascular assessment, potentially eligible women are invited to attend a cardiovascular screening visit. After informed consent, a urine pregnancy test is performed to confirm eligibility. The visit includes clinical and laboratory measurements as well as a structured interview to assess domains that were measured in the nuMoM2b pregnancy: physical activity, depression, social support, psychological stress, and nutritional status. Women with sleep breathing assessments during their nuMoM2b pregnancy are offered another overnight sleep study.