Vitamin D deficiency in early pregnancy may cause the disruption of fetal brain development and neurodevelopmental function. This study aimed to explore the extent of neurodevelopment disruption could be associated with maternal vitamin D deficiency.

A cohort study was conducted in Sukabumi and Waled, West Java, Indonesia, beginning in July 2016. Maternal serum 25(OH)‐vitamin D was measured between 10 and 14 weeks of gestational age. Child development was measured using the Ages and Stages Questionnaire‐3 (ASQ‐3) at age 3, 6 and 12 months.

A total of 141 mother–infant pairs participated. One pair was excluded due to anencephaly of the infant. Vitamin D deficiency was found in 27 (19%) mothers, but delays occurred in gross motoric function among 104 (76.1%) infants and in problem‐solving functions among 61 (43.7%) infants at 3 months old. In general, the …