Findings

What do systematic reviews say?

2 questions · 2 findings · 1 reviews · Pregnancy and Childbirth

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No studies found 0 · 0%GRADE not reported 0 · 0%Very low 1 · 50%Low 1 · 50%Moderate 0 · 0%High 0 · 0%

Vitamin D + calcium + other vitamins and minerals vs calcium + other vitamins and minerals (but no vitamin D)

Low birthweight · pregnant women and their infants..

Vitamin D + calcium + other vitamins and minerals showed no clear difference in low birthweight (less than 2500 g) compared with calcium + other vitamins and minerals (but no vitamin D) (low certainty).

1 finding from 1 review

Vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 1.12 [0.82, 1.51]
1 study · 1298 participants
Low

Vitamin D plus calcium vs placebo or no intervention

Low birthweight · pregnant women and their infants..

It is very uncertain whether vitamin D + calcium supplementation changes low birthweight (less than 2500 g) compared with placebo or no intervention (very low certainty).

1 finding from 1 review

Vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 0.68 [0.1, 4.55]
2 studies · 110 participants
Very low