This study assessed prenatal hemoglobin levels on early child psychomotor development. It found an inverted U-shaped relationship between prenatal hemoglobin at first and second antenatal care visit and infant gross motor function. This indicates that low and high hemoglobin concentrations during pregnancy may be detrimental to the early motor functions of one-year-old children; there appears to be a hemoglobin concentration range that may be optimal.
Pediatrics. 2015