Neuroimaging Ancillary Study

Inclusion Criteria: * For the maternal participant in the parent RAPIDIRON Trial - a pregnancy that has not gone beyond the period for obtaining a fetal MRI (by scanning the mother at 32-35 weeks fetal gestational age) * An indication of the pregnant woman's intent to deliver in the study area and to reside there so as to be available not only to complete RAPIDIRON participation but also to allow her and her offspring to participate in ancillary study visits; * Informed consent of the pregnant RAPIDIRON participant for her participation and that of her offspring in this ancillary trial; and * Concurrent participation in the RAPIDIRON-KIDS follow-up study (NCT05504863). Exclusion Criteria: * If a fetal brain anomaly is found when the maternal participant undergoes an MRI at 32-35 weeks fetal gestational age, the dyad would be excluded from the ancillary study; * If any of the following occur, this would result in dyad ineligibility for participation or continued participation in this ancillary study: maternal blood transfusion after enrollment, a pregnancy ending in stillbirth, neonatal death, diagnosis in the offspring of moderate to severe hypoxic-ischemic encephalopathy (or HIE), and/or blood transfusion to the offspring.