The intervention showed no clear difference in social support vs less intensive interventions 9 (high certainty).
It is very uncertain whether multiple methods of breastfeeding support (including social,… changes any breastfeeding at 6 months compared with usual care (very low certainty).
It is very uncertain whether multiple methods of breastfeeding support (including social,… changes non‐initiation of breastfeeding compared with usual care (very low certainty).
It is very uncertain whether multiple methods of breastfeeding support (including social,… changes exclusive breastfeeding at 4‐6 weeks compared with usual care (very low certainty).
It is very uncertain whether multiple methods of breastfeeding support (including social,… changes exclusive breastfeeding at 6 months compared with usual care (very low certainty).
The review found no eligible studies for this question.
Outcomes for all interventions for smoking cessation in pregnancy leads to higher abstinence at 0 to 5 months postpartum compared with control: subgrouped by main intervention strategy (comparison 20) (high certainty).
Outcomes for all interventions for smoking cessation in pregnancy leads to lower low birthweight (under 2500 g) compared with control: subgrouped by main intervention strategy (comparison 20) (high certainty).
Outcomes for all interventions for smoking cessation in pregnancy showed no clear difference in preterm birth (under 37 weeks) compared with control: subgrouped by main intervention strategy (comparison 20) (high certainty).
Outcomes for all interventions for smoking cessation in pregnancy showed no clear difference in mean birthweight (g) compared with control: subgrouped by main intervention strategy (comparison 20) (high certainty).
Outcomes for all interventions for smoking cessation in pregnancy showed no clear difference in stillbirths compared with control: subgrouped by main intervention strategy (comparison 20) (high certainty).
Outcomes for all interventions for smoking cessation in pregnancy leads to lower NICU admissions compared with control: subgrouped by main intervention strategy (comparison 20) (high certainty).
The intervention leads to higher counselling vs usual care (high certainty).
The intervention showed no clear difference in health education vs usual care (moderate certainty).
The intervention probably leads to higher feedback vs usual care (moderate certainty).
The intervention leads to higher incentives vs alternative interventions 7 (high certainty).
The intervention showed no clear difference in exercise vs usual care (moderate certainty).
The intervention showed no clear difference in other (active dissemination vs passive dissemination) (moderate certainty).