Screen Time in One-Year-Olds Linked to Developmental Delays, New Study Reveals

October 17th, 2023

By John Patterson

Staff Writer for Wake Up World

In a ground breaking study that sheds light on the impact of screen time on early childhood development, researchers from Tohoku University, in collaboration with Hamamatsu University School of Medicine, have uncovered a significant association between screen time exposure in one-year-olds and subsequent developmental delays. Published in the esteemed journal JAMA Pediatrics, this research delves into the repercussions of screen-based activities on our youngest generation.

Analyzing the Tohoku Medical Megabank Project Birth and Three-Generation Cohort Study

The study delved into the lives of 7,097 mother-child pairs who were part of the Tohoku Medical Megabank Project Birth and Three-Generation Cohort Study. By utilizing parental questionnaires, the research assessed the screen time habits of these children. The study encompassed a wide array of electronic devices with visual displays, including televisions, video game displays, tablets, and mobile phones.

The Screen Time Breakdown

The children’s screen time was categorized into several segments: less than one hour, one to less than two hours, two to less than four hours, and four or more hours. Remarkably, nearly half of the subjects fell into the category of less than one hour of screen time, with 29.5% spending one to less than two hours, 17.9% allocating two to less than four hours, and 4.1% indulging in four or more hours of screen exposure.

A Multifaceted View of Child Development

Unlike previous studies that often provided a generalized perspective on child development, this research segmented development into various domains: communication, gross motor skills, fine motor skills, problem-solving abilities, and personal-social skills. This meticulous approach illuminated the nuances in developmental delays associated with screen time.

The Intriguing Findings

The study yielded a noteworthy revelation: an evident dose-response association between screen time during the first year of life and subsequent developmental delays. This implies that the extent of developmental delay is directly correlated with the amount of screen time experienced by the child. This association was most pronounced when the children reached the age of two, showing delays in all domains except gross motor skills. However, by the age of four, the impact was less pronounced, manifesting primarily in communication and problem-solving domains.

Insights from the Researcher

Tohoku University epidemiologist Taku Obara, the corresponding author of the research, emphasized the significance of considering distinct domains in discussions about screen time and child development. “The differing levels of developmental delays in the domains…suggests that the domains should be considered separately,” noted Obara.

Navigating Screen Time Guidelines

The study was spurred by recent guidelines from the American Academy of Pediatrics, which underscored the importance of limiting screen time to ensure ample physical activity and social interaction for children. In an era marked by the proliferation of digital devices and intensified by the COVID-19 pandemic, children’s screen time has surged dramatically, underscoring the need for deeper understanding of its effects.

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Causation or Association?

Obara underlined a crucial distinction: the study reveals an association, not causation, between screen time and developmental delay. While the findings suggest a compelling link, they do not unequivocally state that screen time directly causes developmental delays. As Obara stated, “We use the term ‘delay’…but it is debatable whether this difference in development is really a ‘delay’ or not”.

Future Prospects

As the study advances, Obara expresses a desire to delve into the impact of various types of screen exposure. This would shed further light on the specific mechanisms through which screen time may influence child development, offering a more comprehensive understanding of this intricate relationship.

In Conclusion

The study from Tohoku University serves as a clarion call for parents, educators, and policymakers to consider the multifaceted impact of screen time on child development. While not a direct causative link, the study highlights the importance of balanced screen time, urging a shift from generalized recommendations to a nuanced understanding of its potential effects. As children’s digital interactions become increasingly ingrained in their lives, studies like this offer a compass for navigating the uncharted territory of screen time and its intricate interplay with early development.


  1. Ippei Takahashi, Taku Obara, Mami Ishikuro, Keiko Murakami, Fumihiko Ueno, Aoi Noda, Tomomi Onuma, Genki Shinoda, Tomoko Nishimura, Kenji J. Tsuchiya, Shinichi Kuriyama. Screen Time at Age 1 Year and Communication and Problem-Solving Developmental Delay at 2 and 4 YearsJAMA Pediatrics, 2023; DOI: 10.1001/jamapediatrics.2023.3057

About the author:

John Patterson is an avid writer and researcher who delves into the latest scientific research. With an insatiable curiosity, he translates complex concepts into accessible narratives, allowing readers to embark on a journey of discovery. Through his work, John bridges the gap between experts and the public, igniting curiosity and inspiring meaningful conversations about scientific breakthroughs.

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