Screen time and children’s language: why parents’ digital habits matter too

When we talk about screens and children’s development, the focus tends to fall on one question: how much screen time is the child having?

New research published in JAMA Paediatrics suggests that may be too narrow a question.

A three-year study following 747 children from approximately ages five to seven found an association not only between children’s digital device ownership and language performance, but between parents’ smartphone use and the development of children’s vocabulary.

The findings add to an increasingly important conversation about the digital environment surrounding a child and why healthy screen habits may need to be considered at a family level.

What did the researchers find?

Researchers examined several aspects of screen use, including children’s daily screen time, whether they owned their own digital device, parents’ social media use and the primary parent’s smartphone screen time.

Children’s receptive vocabulary and grammar were assessed annually, and one of the most notable findings concerned parental smartphone use.

Greater smartphone screen time among the primary parent was associated with slower growth in children’s receptive vocabulary between approximately five and seven years of age.

For every additional hour per day of primary-parent smartphone use, the researchers found a 0.42-point slower annual growth in the child’s receptive vocabulary raw score.

The study also found that children who owned a digital device at ages four to five had lower language scores at the beginning of the study than those who did not. They scored, on average, 5.13 points lower in receptive vocabulary and 4.56 points lower in receptive grammar.

Importantly, most of the measures of children’s own screen use were not associated with the rate at which their language developed, and that distinction matters.

The research does not support a simplistic conclusion that all screen use causes poorer language development. Instead, the findings suggest that how digital technology sits within family life may be important too.

Why might parental smartphone use matter?

Children do not develop language simply by hearing words.

Language develops through interaction: conversation, shared attention, responding to questions, storytelling, play, reading together and the countless small exchanges that happen throughout everyday family life.

The researchers discuss previous evidence suggesting that parental smartphone use can interrupt parent-child interactions and may reduce opportunities for the responsive communication that supports word learning.

That doesn’t mean parents should never use a phone around their children. Smartphones are an unavoidable part of modern family life and are used for work, communication, navigation, banking, school administration and countless other everyday tasks.

The research gives us another reason to think about when and how devices are used around children, rather than focusing exclusively on children’s own screen time.

The importance of everyday interaction

For health professionals working with children and families, this distinction is important.

Questions about digital wellbeing can go beyond simply asking parents how many hours a child spends on a screen.

What happens at mealtimes? Is a phone regularly present during conversations? Does the child have their own device? Are screens displacing reading, play or opportunities for conversation? How are adults themselves using technology when they are with their children?

These are more nuanced questions and potentially more useful ones.

As HPFSS member and Speech and Language Therapist Sandy Chappell has previously highlighted, everyday conversations and interactions play an enormously important role in children’s language development.

A book read together, a conversation on the way to school, a song, a game or simply talking about what happened during the day may appear small, but together these interactions create repeated opportunities for children to hear, understand and use language.

Association is not causation

As with all research of this kind, the findings need to be interpreted carefully.

This was an observational cohort study, so it cannot establish that parental smartphone use caused slower vocabulary growth or that owning a device caused children to have lower language scores.

There may be other differences between families that contribute to the associations observed. The researchers adjusted their analysis for parental education and household income, but they acknowledge that further research is needed to understand the mechanisms involved.

It is also worth emphasising that the study found most screen-use indicators were not associated with children’s language growth.

That makes the findings more nuanced, not less important.

Rather than treating every screen exposure as equivalent, they point towards the need to understand the context in which technology is being used.

Looking at the whole digital environment

For HPFSS, this research reinforces an important principle.

Children’s digital health cannot be understood solely by counting their individual hours of screen time.

We need to consider what children are doing on screens, when devices are being used, what screen use may be displacing and the digital habits of the family around them.

For parents, this is not about creating another source of guilt. It is about recognising something positive: many of the interactions that support children’s development are remarkably simple.

Talking. Reading. Playing. Listening. Sharing attention. Putting our own phones away long enough to make space for them.

Turning the research into practical change

For parents, this research isn’t about guilt. It is a useful reminder that healthy digital habits are something we can build as a family, and that our own relationship with our phones matters too.HPFSS has a range of free resources to help families make practical changes, including guidance on how our own screen use affects our children, healthier screen-time tips and age-specific Family Digital Plans.

Explore our resources for families here

Read the full Jama report here