The rise of digital tools in the 21st century has significantly increased screen exposure among toddlers, raising concerns about its impact on their overall psychological development. Since attentional skills and prosocial behaviors play a key role in the development of toddlers' cognitive, emotional, and social functioning, the current research explores the links between screen habits of 6- to 36-month-old toddlers and their development of attentional skills and prosocial behaviors. For this purpose, we observed 148 toddlers, assessing their screen exposure via parental questionnaires and developmental outcomes using a variety of conventional experimental tasks. The main results showed that toddlers aged 6 to 18 months already exposed to screens exhibited fewer joint attention behaviors. However, sustained attention and prosocial behaviors of toddlers aged 19 to 36 months were significantly better in those who experienced interactive co-viewing during exposure. These results suggest that while extensive screen time can displace crucial developmental interactions and negatively impact early developmental skills, active parental involvement can mitigate these effects. Promoting balanced screen management and fostering strong family interactions are therefore essential to reduce potential developmental risks associated with screen exposure.