Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

199 questions · 201 findings · 12 reviews · Pregnancy and Childbirth

No studies found 55 · 27.4%GRADE not reported 8 · 4%Very low 29 · 14.4%Low 57 · 28.4%Moderate 47 · 23.4%High 5 · 2.5%

Summary of findings table ‐ Breastfeeding support only vs usual care

Stopping exclusive breastfeeding at 2 months · healthy breastfeeding women with healthy term babies

Summary of findings table ‐ Breastfeeding support only probably leads to lower stopping exclusive breastfeeding at 2 months compared with usual care (moderate certainty).

2 findings from 1 review

Summary of findings table ‐ Breastfeeding support only vs usual care

Stopping breastfeeding (any) at 3‐4 months · healthy breastfeeding women with healthy term babies

Summary of findings table ‐ Breastfeeding support only probably leads to lower stopping breastfeeding (any) at 3‐4 months compared with usual care (moderate certainty).

1 finding from 1 review

Summary of findings table ‐ Breastfeeding support only vs usual care

Stopping breastfeeding (any) at 9 months ‐ not reported · healthy breastfeeding women with healthy term babies

Summary of findings table ‐ Breastfeeding support only may leads to lower stopping breastfeeding at 9 months compared with usual care (low certainty).

1 finding from 1 review

Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Maternal anaemia · pregnant women

It is very uncertain whether summary of findings table ‐ Vitamin B12 supplementation changes maternal anaemia compared with placebo/no vitamin B12 supplementation (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Maternal vitamin B12 deficiency · pregnant women

It is very uncertain whether summary of findings table ‐ Vitamin B12 supplementation changes maternal vitamin B12 deficiency compared with placebo/no vitamin B12 supplementation (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Low birthweight · pregnant women

Summary of findings table ‐ Vitamin B12 supplementation showed no clear difference in low birthweight (< 2500 g) compared with placebo/no vitamin B12 supplementation (low certainty).

1 finding from 1 review

Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Preterm birth · pregnant women

Summary of findings table ‐ Vitamin B12 supplementation showed no clear difference in preterm birth (< 37 weeks) compared with placebo/no vitamin B12 supplementation (low certainty).

1 finding from 1 review