Prenatal vitamin D status and long-term neurocognitive outcomes: building on an emerging evidence base

Vitamin D sufficiency during pregnancy has long been recognized for its importance in fetal bone development.Still, a growing body of evidence is shedding light on its broader role in neurodevelopment. [1][2]2][3][4][5][6] The recently published manuscript by Valera-Gran et al. in Pediatric Research contributes meaningfully to this evolving field. 7Drawing on the ECLIPSES cohort, a prospective study of pregnant women and their offspring in Catalonia, Spain, the authors present compelling evidence that higher maternal 25hydroxyvitamin D [25(OH)D] concentrations during pregnancy are positively associated with improved neurocognitive outcomes in children at four years of age.These findings reinforce earlier reports and offer new insights into the importance of trimesterspecific maternal vitamin D status on child development.The ECLIPSES study followed 289 mother-child pairs, with measurement of maternal 25(OH)D concentrations during the first and third trimesters and assessment of neurodevelopment at age four years using a comprehensive battery of validated instruments: the Wechsler Preschool and Primary Scale of Intelligence (WPPSI-IV; which assesses a child's intellectual development across various areas, including verbal comprehension, visual-spatial reasoning, fluid reasoning, working memory, and processing speed in preschool children from 2 years 6 months up to 7 years 7 months), the Developmental NEuroPSYchological Assessment, Second Edition (NEPSY-II; which assesses a wide range of neuropsychological domains including attention and executive function, language, memory and learning, sensorimotor, social perception, and visuospatial processing), and the Behavior Rating Inventory of Executive Function -Preschool Version (BRIEF-P; which focuses on assessing executive functions, involved in goaldirected behavior in young children ages 2-5 years 11 months).The authors found that higher first-trimester 25(OH)D concentrations were positively associated with verbal development and visuomotor precision.In contrast, third-trimester concentrations were related to visuomotor precision and executive function.The robustness of these findings is strengthened by the careful adjustment for potential confounders, including maternal BMI, diet, lifestyle, and sociodemographic variables.Importantly, these results build on an earlier study from the same group.In that report, maternal vitamin D status was evaluated in relation to infant neurodevelopment at 40 days postpartum using the Bayley Scales of Infant Development-III. 6he study demonstrated that deficient first-trimester 25(OH)D concentrations (<30 nmol/L) predicted poorer performance in