This study aims to evaluate the effectiveness of an online video-based developmental support program for parents of children aged 1-3 years receiving care at a Family Health Center. Approximately 60 parents will be randomly assigned to either an intervention group, which will receive a four-week online developmental support program, or a control group, which will continue to receive usual healthcare services. Data will be collected at baseline, two weeks after the intervention, and at one- and three-month follow-up assessments. The study will examine the effects of the online video-based developmental support program on parents' attitudes toward child development, developmental awareness, parenting self-efficacy, and the quality of the home environment that supports child development.