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  • Title: Seasonal variation in paired maternal-newborn serum 25-hydroxyvitamin D and 24,25-dihydroxyvitamin D concentrations in Israel.
    Author: Nehama H, Wientroub S, Eisenberg Z, Birger A, Milbauer B, Weisman Y.
    Journal: Isr J Med Sci; 1987 Apr; 23(4):274-7. PubMed ID: 3497905.
    Abstract:
    Seasonal changes were observed in the vitamin D status of mothers and their newly born infants in sunny Israel. Maternal and newborn serum levels of 25-hydroxyvitamin D (25-OHD) were lower (less than 0.01) in March-April (n = 45 pairs), than in September-October (n = 33 pairs). Parallel seasonal changes were also found in serum 24,25-dihydroxyvitamin D [24, 25-(OH)2D] concentrations. In the spring, 20% of the mothers and 40% of their infants had vitamin D deficiency or borderline serum 25-OHD levels. In the autumn, in contrast, none of the mothers and only one newborn were vitamin D-deficient, and one mother and two newborns had borderline serum 25-OHD levels. The results demonstrate that even in Mediterranean climates there are seasonal changes in maternal vitamin D status, which have a significant effect on the serum levels of vitamin D metabolites in their newborn infants. This raises the question as to whether vitamin D supplements should be given to pregnant women in Israel, at least during the winter.
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