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Objective   The main goal of our study was to assess relationships between first trimester 25-hydroxyvitamin D3 levels and infant birthweight and length at birth.Materials and Methods   We conducted a study over our medical records of 154 live-term births at Acibadem Atakent Hospital, Istanbul, Turkey. Subjects were classified into five independent groups.Results   We retrospectively reviewed a total of 154 live birth records. They took vitamin D3 supplement 1000 U/day. We classified the serum vitamin D levels into 5 groups by concentration. Group 1 comprised serum vitamin D levels <10 ng/ml ( n  = 41); group 2 comprised serum Vitamin D levels between >10–16 ng/ml ( n  = 33); group 3 comprised serum vitamin D levels >16–20 ng/ml ( n  = 26); group 4 vitamin D level between >20–30 ng/ml ( n  = 33) and group 5 comprised vitamin D levels >30 ng/ml. The femurs of infants were found to be longer between the groups, although the differences were not significant ( p =0.054). There was also a statistically significant difference in the neonatal birth weight ( p =0.048).Conclusion   We observed associations between low and high maternal 25-hydroxyvitamin D3 levels and fetal growth at birth weight but no difference in birth length. We conclude that we always need to conduct further research to be able to predict the effects of vitamin D deficiency.

obstetrics and gynecology international

The Relationship between First Trimester 25-Hydroxyvitamin D3 Levels and Second Trimester Femur Length and Their Effects on Birth Weight and Length at Birth: A Preliminary Study