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BackgroundReducing preterm birth and stillbirth and improving outcomes for babies born too soon is essential to reduce under-5 mortality globally. In the context of a rapidly evolving evidence base and issues with extrapolating efficacy data from high- to low-income settings, an assessment of the evidence for maternal and newborn interventions specific to low- and middle-income countries (LMICs) is required.MethodsA systematic review of the literature was done. We included all studies performed in LMICs since the Every Newborn Action Plan,1 between 2013 - 2018, which reported on interventions where the outcome assessed was reduction in preterm birth or stillbirthincidence and/or a reduction in preterm infant neonatal mortality. Evidence was categorised according to maternal or neonatal intervention groups and a narrative synthesis conducted.Findings179 studies (147 primary evidence studies and 32 systematic reviews) were identified in 82 LMICs. 81 studies reported on maternal interventions and 98 reported on neonatal interventions. Interventions in pregnant mothers which resulted in significant reductions in preterm birth and stillbirth were (i) multiple micronutrient supplementation and (ii) enhanced quality of antenatal care. Routine antenatal ultrasound in LMICs increasedidentification of fetal antenatal conditions but did not reduce stillbirth or preterm birth due to the absence of services to manage these diagnoses. Interventions in pre-term neonates which improved their survival included (i) feeding support including probiotics and (ii) thermal regulation. Improved provision of neonatal resuscitation did not improve pre-term mortality rates, highlighting the importance of post-resuscitation care. Communitymobilisation, for example through community education packages, was found to be an effective way of delivering interventions.ConclusionsEvidence supports the implementation of several low-cost interventions with the potential to deliver reductions in preterm birth and stillbirth and improve outcomes for preterm babies in LMICs. These, however, must be complemented by overall health systems strengthening to be effective. Quality improvement methodology and learning health systems approaches can provide important means of understanding and tackling implementation challenges within local contexts. Further pragmatic efficacy trials of interventions in LMICs are essential, particularly for interventions not previously tested in these contexts.

Additional file 3: Figure S3. Annual average rate of change of DFPSm among unmarried sexually active AGYW (overall, poorest andrichest) by country.

Additional file 5: Table S2. DFPSm among AGYW in SSAby marital status, sub-region, country, and household wealth status.

Additional file 2: Figure S2. Annual average rate of change of DFPSm among married AGYW (overall, poorest andrichest) by country.

Additional file 4: Table S1. Data sources and and sample sizes by year of survey and marital status.