Vitamin D Levels in Pregnant Women Do Not Affect Neonatal Bone Strength

Orly Levkovitz*, Elena Lagerev, Sofia Bauer-Rusak, Ita Litmanovitz, Eynit Grinblatt, Gisela Laura Sirota, Shachar Shalit, Shmuel Arnon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Vitamin D plays a key role in regulating calcium and phosphate metabolism. However, whether maternal vitamin D levels affect fetal bone strength is unclear. This study assessed corre-lations between maternal 25(OH)D status and neonatal bone strength 25(OH)D levels, these were measured in the maternal and infant cord blood of 81 mother–infant dyads. Bone strength was measured using a quantitative ultrasound (QUS) of tibial bone speed of sound (SOS). Maternal vitamin D intake, medical history and lifestyle were evaluated from questionnaires. Maternal 25(OH)D levels were deficient (<25 nmol/L) in 24.7%, insufficient (25–50 nmol/L) in 37% and sufficient (>50 nmol/L) in 38.3%. The maternal and cord blood 25(OH)D levels correlated (r = 0.85, p < 0.001). Cord blood levels (57.9 ± 33.5 nmol/L) were higher than the maternal blood levels (46.3 ± 23.2: p < 0.001). The mean SOS was 3042 ± 130 m/s. The neonatal SOS and 25(OH)D levels were not correlated. The mean bone SOS levels were comparable in the three maternal and cord blood 25(OH)D groups. No correlation was found between the maternal 25(OH)D levels and the neonatal anthropometrics. Although the 25(OH)D levels were higher in Jewish mothers than they were in Muslim mothers (51.1 ± 22.6 nmol/L vs. 24 ± 14.7 nmol/L, respectively: p = 0.002) and in those who took supple-mental vitamin D, the bone SOS levels were comparable. In conclusion, maternal vitamin D levels correlate with cord levels but do not affect bone strength or growth parameters.

Original languageEnglish
Article number883
JournalChildren
Volume9
Issue number6
DOIs
StatePublished - Jun 2022

Keywords

  • 25-hydroxy vitamin D
  • bone strength
  • neonate
  • nutrition
  • pregnancy
  • quantitative ultrasound
  • speed of sound

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