The increasing exposure of infants to digital media has generated growing interest in understading how specific audivisual content influences early attention and engagement. This study examines the effects of CoComelon, one of the world's most popular children's YouTube channels, on infant behavioral responses. Using a mixed-methods approach, ten infants aged 5–7 months were exposed to both CoComelon and non-CoComelon nursery videos in controlled observational settings. Quantitative measures included gaze duration, vocalizations, physical movements, and smiling frequency, while qualitative observations focused on imitation, affective reactions, and early communicative behaviors. Platform-level analytics from YouTube, including view counts and engagement indicators, were also analyzed to contextualize the findings. Results showed that CoComelon significantly outperformed comparison videos across all behavioral indicators. Infants displayed longer visual attention, more frequent vocalizations, increased motor activity, and higher rates of smiling during CoComelon exposure. Qualitative findings revealed greater gesture imitation, vocal mimicry, and turn-taking behaviors, suggesting enhanced cognitive and socio-emotional engagement. The findings indicate that rhythmic repetition, audiovisual synchrony, emotionally expressive characters, and infant-directed prosody are key elements supporting infant attention and interaction. This study contributes to developmental media research by demonstrating how specific content design features shape early behavioral responses and offers practical insights for caregivers, educators, and media developers
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