BackgroundDespite considerable global efforts to reduce growth faltering in early childhood, rates of stunting remain high in many regions of the world. Current interventions primarily target nutrition-specific risk factors, but these have proven insufficient. The objective of this study was to synthesize the evidence on the relationship between active tobacco use during pregnancy and growth outcomes in children under five years of age.MethodsIn this systematic review and meta-analysis, six online databases were searched to identify studies published from January 1, 1980, through October 31, 2016, examining the association between active tobacco use during pregnancy and small-for-gestational age (SGA), length/height, and/or head circumference. Ecological studies were not included. A meta-analysis was conducted, and subgroup analyses were carried out to explore the effect of tobacco dosage.ResultsAmong 13,189 studies identified, 210 were eligible for inclusion in the systematic review, and 124 in the meta-analysis. Active tobacco use during pregnancy was associated with significantly higher rates of SGA (pooled adjusted odds ratio [AORs] = 1.95; 95% confidence interval [CI]: 1.76, 2.16), shorter length (pooled weighted mean difference [WMD] = 0.43; 95% CI: 0.41, 0.44), and smaller head circumference (pooled WMD = 0.27; 95% CI: 0.25, 0.29) at birth. In addition, a dose-response effect was evident for all growth outcomes.ConclusionTobacco use during pregnancy may represent a major preventable cause of impaired child growth and development.Electronic supplementary materialThe online version of this article (10.1186/s12889-018-6137-7) contains supplementary material, which is available to authorized users.

The demonstration of differences between biomedical concepts of nutrition and the knowledge frameworks of northern Senegalese women with regard to IYC feeding highlights the value of knowledge about emic perspectives of local communities to help guide decisions about interventions to improve nutrition.

Caregivers make decisions about how to feed their infants and young children based on complex interactions of knowledge, beliefs, and values, as well as assessments of situational determinants, including economic and social constraints and opportunities. Because of the relationship of these factors to the adoption of new feeding behaviours, the development of nutrition interventions for this age group must be grounded in knowledge about the target population. This paper presents the results of a study that used cognitive mapping techniques to gain insight into mothers' knowledge and perceptions of foods for infants and young children and examine their significance for feeding decisions in Saint-Louis, northern Senegal. Guided by mixed-methods protocols from the Focused Ethnographic Study for Infant and Young Child Feeding Manual, in-depth interviews that included qualitative discussions and cognitive mapping techniques were conducted with 46 mothers in rural and peri-urban communities. We explored mothers' perceptions about five dimensions that affect food decision-making-healthiness, convenience, child acceptance, appeal, and modernity-and the relationship of these dimensions to 38 local food items. Data analysis entailed a combination of qualitative thematic analysis and descriptive statistics. In both communities, "healthiness" was the most valued dimension for food decision-making by a large margin, followed by child acceptance, appeal, modernity, and convenience. We explore how different interpretations and definitions of these dimensions, and their relationship to specific local food items, may influence the design and planning of nutrition interventions. The results support the importance of mixed-methods formative research to illuminate the emic perspectives of caregivers.