Research on maternal nutrition before conception remains very limited, despite evidence of its importance during this period and throughout the first trimester of pregnancy. This project aims to determine the benefits to the children of women in poor, food-insecure environments of taking a daily comprehensive maternal nutrition supplement (with additional balanced calorie/protein supplement for underweight participants) at least three months prior to conception versus the benefits of the same supplement at 12-14 week gestation, compared to a third group who receive no supplement.