Supplementation of women with cholecalciferol during pregnancy did not lead to increased offspring whole-body Bone Mineral Content.

The study found that the neonatal whole-body BMC of babies born to mothers assigned to cholecalciferol 1000 IU/day did not significantly differ from that of babies born to mothers assigned to placebo. Also, mothers in the placebo group suffered from postpartum hemorrhage than in the cholecalciferol group.
Reference: Cyrus Cooper, Nicholas C Harvey et al. Maternal gestational vitamin D supplementation and offspring bone health (MAVIDOS): a multicenter, double-blind, randomized placebo-controlled trial, The Lancet Diabetes & Endocrinology 2016, DOI: http://dx.doi.org/10.1016/S2213-8587(16)00044-9.
Source-Medindia