The period centers on initiating structured rehabilitation early for high-risk infants and disabled children, with a strong emphasis on dosage, timing, and intensity of therapy delivered across hospital, home, and community settings. Methodologies coalesced around randomized trials, meta-analyses, and longitudinal designs that link early intervention to measurable developmental and functional outcomes, fostering a family-centered, interdisciplinary approach that scales to universal services. This convergence defines a formative shift toward dosage-aware rehabilitation embedded within standard pediatric care.