Link between screen time at 1yo and developmental delays later in childhood

The more time one-year-old children spend watching television, playing video games or using mobile phones, tablets or other devices, the more likely they are to have an increased risk of developmental delays later in childhood, particularly in the areas of communication and problem-solving, a new study has found. 

Researchers from Tohoku University in Japan recruited 7,097 mother-child pairs and, using a questionnaire, children’s screen time at age one was assessed, with a view to learning more about whether screen time at age one affected future development, particularly in the areas of communication, motor skills, problem-solving, and personal and social skills.

Mothers were asked, “On a typical day, how many hours do you allow your children to watch TV, DVDs, video games, internet games (including mobile phones and tablets), etc.?” There were five response categories: none, less than one, one to less than two, two to less than four, or four or more hours a day.

When the children were aged two and four years of age, their developmental performance was assessed using the third edition of the Ages and Stages Questionnaire (ASQ-3), a developmental and social-emotional screening tool for children between birth and age six.

In terms of screen time exposure per day, the majority (48.5 per cent) of children had less than one hour. Only 4.1 per cent of children had four or more hours per day. After adjusting for independent variables, the researchers observed an association between screen time at age one and a higher risk of development delay at age two in the communication, fine motor, problem-solving and personal and social skills domains. 

At age four, there was a relationship between early screen watching and a delay in the communication and problem-solving domains, meaning the delay in relation to fine motor, personal and social skills seen at two was no longer seen.

The findings, researchers say, suggest a dose-response association between longer screen time at age one and developmental delays in communication and problem-solving at ages two and four. In particular, more than four hours of screen time per day was associated with these delays in both older age groups.

One hypothesis put forward by the researchers to explain this change is that the children’s fine motor, personal and social skills simply ‘caught up’ between the ages of two and four. 

Alternatively, they hypothesise that it’s a case of ‘reverse causation’; that is, a developmental delay in fine motor, personal and social skills leads to increased screen time. Further follow-up studies are required to further investigate this phenomenon.

Although screen time was associated with developmental delay, researchers said, there may be an educational aspect depending on the types of programs viewed. One of the study’s limitations, as noted by the researchers, is that they didn’t separate educational screen time from other types of screen time.

It’s important to point out that this study suggests that there is a relationship between screen time and developmental delay in children, but it doesn’t find that screen time causes developmental delays.

Access the findings in full here.