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Serum calcium rapidly declines at birth because of the sudden interruption of the maternal-fetal calcium influx. Several factors are known to influence serum calcium in the first days of life, including circulating concentrations of maternal vitamin D. Objective was to establish the normal range variations of neonatal serum calcium according to the French current vitamin D supplementation during pregnancy, i.e. 100,000 IU of cholecalciferol during the third trimester.
Levaillant et al. (Tue,) studied this question.