Prenatal Lipid-Based Supplementation and Infant Weight-for-Length Z-score Outcomes in the First Year of Life: Evidence From a Community-Based Trial in Pakistan

Background The tribal belt of Pakistan continues to present the highest tendencies of acute malnutrition, a challenge commonly affecting children's growth in infancy across South Asia. Whilst maternal lipid-based nutrient supplements have shown promising results, their effectiveness varies by formulation, dosage, and context. This study evaluated whether providing mothers with medium-quantity lipid-based nutrient supplements (MQ-LNS) during their pregnancy and six months postpartum could improve infant weight-for-length Z-scores (WLZs) at 12 months of age in a food-insecure district of Pakistan. Methodology This study used a community-based, non-randomized controlled trial design in Upper Kurram, Khyber Pakhtunkhwa, from February 2019 through January 2020. Cluster formation was based on Lady Health Worker catchment areas. The study provided Maamta MQ-LNS (75 g/day) to pregnant women from conception through six months of postpartum care. The control group received standard antenatal care (ANC) with iron-folic acid (IFA). The main study result consisted of WLZ measurements based on WHO standards at the 12-month follow-up. The study used multivariable linear regression with cluster-robust standard errors to establish effect sizes and inverse probability of treatment weighting to handle baseline differences. The research evaluated two additional outcomes through length-for-age z-score (HAZ) and wasting (WLZ < -2). Results The study results demonstrated that children whose mothers received MQ-LNS from pregnancy through the first half year of life gained better WLZ than control children at 12 months (adjusted β = 0.29; 95% confidence interval = 0.08-0.51; p = 0.007). The results showed no change in the difference after controlling for maternal and household variables. Mean HAZ was slightly higher in the intervention group (p = 0.038), while the proportion wasted (WLZ < -2) did not differ significantly between groups. Conclusions The research showed that rural mothers who consumed MQ-LNS during pregnancy and early postpartum delivered infants who had better WLZ at 12 months in a food-insecure setting. The findings showed a higher level of nutritional benefits than the standard prenatal small-quantity lipid-based nutrient supplement program, which indicates that MQ-LNS could provide additional benefit in cases of severe nutritional deficiencies. Policy integration within ANC and social protection initiatives, including the Benazir Nashonuma Programme, warrants consideration, alongside assessments of adherence, cost-effectiveness, and supply feasibility.