Inclusion Criteria:  Delivery at our institution Hemoglobin below 9 g/dl in postpartum day 1 Singleton gestation  Exclusion Criteria:  Diagnosis of malabsorptive disorder or history of gastric bypass procedure Known diagnosis of anemia other than iron deficiency (thalassemia, macrocytic anemia, sickle cell, etc.) Significant cardiovascular disease, including but not limited to myocardial infarction or unstable angina within 6 months prior to study inclusion or current history of NYHA Class III or IV congestive heart failure Patient has received blood transfusion or there is a plan to transfuse Lactose intolerance