We all do it. You need five quiet minutes to answer an email or make dinner, so you hand your preschooler the tablet. “Just watch something,” you say. It feels harmless—maybe even helpful. But a brand-new study out this month says that solitary screen time (when kids are completely alone with their devices) might be quietly making things worse, especially for the many young children who already have trouble expressing themselves with words.

The research, published in Research on Child and Adolescent Psychopathology, followed 546 Danish 4- and 5-year-olds across a single school year. At the beginning of the year, teachers measured two key language skills: how well the kids could communicate in everyday situations (like chatting while helping make lunch) and how many words they could understand and say. Parents reported how much time their children spent using screens alone—watching TV or movies or playing games on tablets or phones—with no adult or other kids around.

Six months later, the same teachers rated the children’s behavior in terms of “conduct problems” (tantrums, fighting, lying, not following rules) and “emotional problems” (worrying a lot, seeming unhappy or withdrawn).

Here’s what they found:

In plain English: Screens alone don’t just fill time—they appear to amplify the very challenges some kids already face.

Why does this happen? The researchers explain it. Good language skills help children manage frustration, understand other people’s feelings, and ask for what they need. When those skills are still developing, kids can get stuck in cycles of being upset or acting out. Solitary screen time gives them zero practice at the social and emotional skills they need most. Instead of talking, negotiating, or playing with others, they’re watching fast-moving videos designed to keep them hooked. That can interfere with the real-world interactions that build self-control and confidence.

The study was conducted in Denmark, a country that provides families with strong support for child development, so the risks were evident even in an ideal setting. That makes the findings especially relevant for all of us.

Devices are engineered to capture attention—they’re brilliant at it. But for young brains still wiring up language, emotion regulation, and social skills, solo screen sessions can quietly work against the very development parents are trying to support.

What can parents do?
The World Health Organization already suggests no more than one hour of screen time per day for 2- to 5-year-olds. This study adds an important extra rule of thumb: Make it social when you can. Watch together and talk about what you see. Turn the tablet off and choose books, blocks, or outdoor play instead—especially if your child is showing any early signs of language delay (which is surprisingly common).

Even small shifts matter. A few extra real conversations or shared play sessions can give a child the social practice that solitary screens can’t provide.

The takeaway is hopeful, not scary: Screens aren’t evil. But how we use them with little kids—particularly those who are still mastering language—can make a real difference in their emotional health and behavior.

If you have a young child at home, take a quick mental inventory this week: How much of their screen time happens alone? A small tweak now could spare everyone a lot of tantrums later.

What’s your experience? Have you noticed behavior changes tied to solo screen time? Reply to this email or share in the comments—I read every one.

Until next issue, stay curious and screen-smart,

“Children need to learn what complex human feelings and human ambivalence look like. And they need other people to respond to their own expressions of that complexity. These are the most precious things that people give to children in conversation as they grow up.” -Sherry Turkle (MIT psychologist and author of Reclaiming Conversation, a leading voice on technology’s impact on child development)