“micronutrient supplementation during pregnancy was associated with a significant increase in intellectual development for teenaged children compared with folic acid or folic acid plus iron supplements.”
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Zhu Z, Cheng Y, Zeng L, et al. Association of Antenatal Micronutrient Supplementation With Adolescent Intellectual Development in Rural Western China: 14-Year Follow-up From a Randomized Clinical Trial. JAMA Pediatr. 2018;172(9):832–841. doi:10.1001/jamapediatrics.2018.1401