Maternal care packages have been proposed as a means to improve neonatal outcomes in resource-limited settings. This study aims to evaluate their impact on neonatal mortality rates. A longitudinal study design was employed, focusing on a cohort of mothers delivering in Congolese rural areas. Data collection included maternal health records and newborn health outcomes over two years. Maternal care packages were associated with a statistically significant reduction (p < 0.05) in neonatal mortality rates by 23% compared to control groups. This study supports the efficacy of integrated maternal newborn care packages in improving neonatal health outcomes, particularly in resource-limited settings. Further implementation and evaluation are recommended to ensure sustainability and scalability of these interventions. Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.