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Macrosomia is diagnosed when excessive intrauterine fetal growth occurs and the birth weight surpasses an established limit.Pregnancies with fetal macrosomia are considered high risk and require intensive antenatal care.The causes and risk factors for fetal macrosomia are diverse.There is a growing body of epidemiologic literature reporting associations between atmospheric pollutants and reproductive outcomes,particularly Low birth weight,but not macrosomia.