What Is the 3 6 9 12 Rule for Screen Time?

You turn on a screen, hand over a tablet or smartphone (maybe some nursery rhymes on YouTube, a quick cartoon, or an “educational app”), or switch on the TV with a fast-paced cartoon designed to grab every bit of your child’s attention… and finally, you breathe.

So, is this 2.0 babysitter a stroke of genius — or a poisoned gift? Let’s help you see things more clearly.

But wait, not so fast! I’m Laureline. I’m an interface designer, and for nearly 10 years I’ve been working on the problematic use of smartphones (since the concept of addiction still isn’t officially recognized by the WHO). For the past four years, I’ve been working on the app Jomo, which I co-created with Thomas, its developer. We’ve written many articles on this topic, and we’ll keep writing them as long as the issue remains relevant. So if this interests you as much as it does us, feel free to explore our blog. Otherwise, enjoy the read!

The 2.0 Nanny: The Poison of the 21st Century

Let’s be honest: putting a child in front of a screen works. And it works really well. They go quiet, they stop moving. You can finally breathe and do what you needed to do, in peace and quiet.

This kind of nanny is cheap, and incredibly convenient. It temporarily solves a lot of problems, and on top of that, kids love it. So what’s the issue? At first glance, it seems like there are only upsides. Well, here’s the thing: that’s the trap.

When a Child’s Brain Isn’t Ready

We won’t go into the full details of human development, but one thing is obvious: for a child to grow in healthy conditions, they need to move, explore, touch everything, and interact with other people. That’s how they learn to understand their environment, navigate it, and develop within it.

But when you place a developing child in front of a screen, you cut them off from that entire world. Instead, they’re exposed to very fast images, bright light, and highly stimulating sounds. Essentially, they make no mental effort anymore. They become completely absorbed—pulled into the content being served to them.

And it feels magical. Suddenly they’re fully focused, completely still. They might even laugh at what they’re watching. It seems like it’s good for them.

But it’s not.

In those moments, the child is in a state of passive hyperstimulation. In other words, their brain is being intensely stimulated, but paradoxically, it isn’t producing anything. It learns to receive huge amounts of stimulation without having to do anything in return. It’s a form of neurological immobilization.

You can probably see where the problem starts.

©️ Art by Steph Meade

When Everything Starts To Feel Too Slow, Too Dull, Too Difficult

Yes, this is the other side of the coin. It’s a bit like us adults: when we constantly feed ourselves ultra-stimulating, fast-paced content, the moment we look up from it, everything else suddenly feels slow… and a bit boring. Making an effort feels unpleasant, there’s no immediate reward… so we’d rather just stay in front of the screen a little longer.

As adults, we can usually manage that frustration. But for a child, it’s much harder. You may have already experienced it yourself: without screens, your child might become more restless, have a shorter attention span, feel more irritable, struggle to keep themselves busy, or even have trouble playing alone.

That’s the price of easy silence. A new, highly addictive medium that temporarily hijacks a child’s attention system, but often leaves you with a child who becomes more and more difficult to manage over time.

But What About “Educational Apps”? Aren’t They Stimulating for My Child?

These apps will never replace you, dear parents. Your child is yours, and it’s your role to teach them about the world.

Yes, these apps do teach certain things: how to tap, swipe, recognize shapes, words, colors, and so on. But they teach all of this in a flat, two-dimensional environment, not in the real, physical world.

A child needs to interact with reality, to manipulate objects, to explore freely according to their own needs (not according to presets programmed into an app), to talk, to imagine, to create.

Take puzzles, for example. An educational app offering digital puzzles will never provide what a real, physical puzzle can. The app mostly delivers quick stimulation with immediate rewards. A physical puzzle, on the other hand, teaches patience, develops fine motor skills, and helps build strong concentration.

In the end, it comes down to a choice: how do you want to raise your child? What do you want them to develop in the long run — versus what you gain for yourself in the moment.

“But if everyone does it, it can’t be that bad.”

Just because everyone does something doesn’t mean it’s a good idea. What we’re seeing today is that modern life is more exhausting: long workdays, lots of time lost to scrolling, constant distractions and mental overload. The result? Parents are exhausted and choose the easiest solution available.

And it’s socially accepted, mostly because people still don’t fully understand the long-term effects. We’re starting to see learning difficulties in some children who are heavily exposed to screens, but the research is still emerging.

Screens have become a modern pacifier. Parents aren’t negligent—they’re just using what’s readily available. “If it’s there, why not use it?”

[IMAGE]

The 3-6-9-12 Rule

Let’s be honest: sooner or later, every child will encounter screens. The goal is to introduce them thoughtfully, gradually, and in a way that matches the child’s age and needs.

This is exactly what French child psychiatrist Serge Tisseron proposed. He created a set of recommendations to guide screen use at key ages: 3, 6, 9, and 12.

• Before age 3 = no screens

  Children simply don’t need screens at this stage. Their brain is under intense development. They need to touch things, move their bodies, explore the real world, and interact with people.

  Screens offer nothing useful at this age and can even disrupt attention, language development, and sleep.

  So before age 3: zero screens. Prioritize free play, books, and human interaction.
  
  

• Before age 6 = no personal console

  Screens can start to be introduced—but only lightly and always with an adult present. Avoid turning on a cartoon and leaving the child alone while you do something else.

  It’s also not recommended for a child to have their own device, use screens alone, or play independently on them.

  Screens can exist, but they should remain a shared and occasional activity, not a refuge or a “digital babysitter.”
  
  

• Before age 9 = no internet alone

  Children can start exploring the internet and using a computer, but they shouldn’t do it alone in their room. It’s strongly recommended to establish clear rules to guide usage—some families even create a digital charter together.

  And it’s worth repeating: as a parent, it’s your job to teach what the internet actually is. Explain both the incredible opportunities it offers and the risks that come with it.

  You’re the one who decides what your child is allowed to see, what’s appropriate, and what could put them at risk. The goal isn’t just to learn how to click—it’s to understand how it all works.
  
  

• Before age 12 = no smartphone

  Young adolescents rarely need a smartphone constantly in their pocket, connected 24/7 to platforms where adults are also present—and where we often have very little visibility.

  More importantly, before age 12 most children simply aren’t ready. Impulse control is still weak, social comparison is extremely strong (their identity is still forming), and social media can have a huge impact on their self-esteem. At the same time, a developing brain is particularly vulnerable to dopamine-driven feedback loops (like the ones used by apps such as TikTok).

  And for parents, it often becomes a constant battle. It’s hard for a child to stay focused on schoolwork when that little device in their pocket lets them chat, watch endless content, or play games instantly.
  
  

• After age 12 = the question isn’t yes or no, but how much

  After 12, banning smartphones entirely often becomes unrealistic. The real question is no longer “Should you allow a smartphone or not?” but rather: how much exposure can your child handle without their brain getting overwhelmed?