It is estimated approximately 9% of Army women are pregnant at any one time. Shortly after delivery, postpartum soldiers are expected to return to full duty, meet body fat standards and pass the APFT. It has never been determined when prepregnancy work capacity or fitness levels return in postpartum women, either civilian or military. Surprisingly little is reported about the risk of injury, bone ... [Show full abstract] health, weight loss, and calcium and iron status at the time postpartum females return to work. This prospective cohort study will evaluate the postpartum health of soldiers by measuring their fitness, injury and illness rates, bone health, iron status, body composition and eating behavior. It seeks to enroll 135 pregnant soldiers, 210 non-pregnant soldiers and 135 pregnant family member controls. Subjects for this study include women who receive their prenatal and postpartum care at Madigan Army Medical Center, Ft. Lewis ,Washington. At present, we have enrolled all pregnant subjects and 135 non-pregnant soldiers. After the six month follow-up period, data analysis will commence.