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1 Introduction Vitamin A, a fat-soluble micronutrient, plays an indispensable role in embryonic development, immune function, and fetal growth (Chen et al. 2018; Verma et al. 2017). The third trimester represents a critical period of rapid fetal development, during which maternal vitamin A levels may experience significant declines due to pregnancy-related physiological changes, hormonal fluctuations, and increased fetal demand (Chen et al. 2018).
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