During this period, emphasis centered on early-life growth patterns and their long-term consequences, integrating anthropometric trajectories, population diversity, and growth standards to model adult stature and socioeconomic gaps. Biomarker-driven assessments of nutritional status and metabolic risk were applied across settings to map population-level health gradients, incorporating infection status and diet-related indicators. Neurodevelopmental and behavioral epidemiology in population children emerged as a core strand, examining hyperactivity, convulsive disorders, temperament, and neuroendocrine correlates, while large-scale ophthalmic screening illustrated opportunities for integrated vision care. Analyses of health service utilization and access in childhood further highlighted disparities and preventive care patterns across socioeconomically diverse groups. Historical Significance: The identified influential works introduced longitudinal birthweight-cognition links, established the epidemiology of suicide in youth, demonstrated the role of infection in nutrition in cross-cultural settings, and validated mass vision screening as a policy-relevant tool. These innovations collectively advanced cross-cultural growth monitoring, integrated infection-control and nutrition interventions, and preventive pediatric eye care, setting the stage for subsequent life-course health research.