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Several earlier reports demonstrated that maternal zinc deficiency during pregnancy was linked with adverse pregnant outcomes.Nevertheless,it needs to be determined whether maternal zinc deficiency during pregnancy elevates the risk of low birth weight (LBW) and small for gestational age (SGA) infants.The objective of this study was to investigate the association between matemal zinc level during pregnancy and the risks of LBW and SGA infants in a large population-based birth cohort study.