Before the COVID-19 pandemic, the American Academy of Pediatrics had fairly strict guidelines: no screen time at all for children under age 2, and minimal exposure for ages 2 to 5. Ideally, screen time should be under an hour a day. For ages 5 to 11 and older, less than two hours per day.

Since the pandemic shifted much of our education and social lives online, we've had to adapt those guidelines a bit. Still, research continues to support limiting screen time to less than two hours a day for older children as well. Exceeding that amount has been associated with increased risks of anxiety, depression and other emotional challenges.

The general consensus among developmental pediatricians is that children under age 3 should have little to no screen exposure. That’s because their brains are in a critical stage of development, with key processes like myelination, the biological process that speeds up the nerve transmission to the brain, and neural pathway formation actively taking place.

When a young brain is exposed to too much screen time, it can overstimulate the visual cortex—the part of the brain that processes images—at the expense of the auditory cortex, which is vital for developing social skills and language. Ideally, we want their early learning to be grounded in real-world, interactive face-to-face experiences—not passive viewing.

Adolescence is a time when the brain is deeply focused on social development and seeking acceptance from peers. Before social media, that feedback loop was limited to in-person interactions with a small group of peers. But now, through apps and platforms, teens are exposed to a constant, amplified stream of approval or disapproval on a much larger scale.

That amplification can be harmful. It places undue stress on the adolescent brain, increasing the risk of social anxiety, low self-esteem and even depression.

Yes, the type of screen can make a difference. A lot of what’s called “educational content” is often just labeled that way for marketing purposes, without clear evidence that it's truly educational. Watching content on a TV screen is generally safer—it’s farther from the eyes and doesn’t strain the neck or vision as much as phones or tablets.

Also, the platform matters. Streaming services like YouTube often auto-play endless content using algorithms to keep kids hooked. There’s no clear stopping point. In contrast, traditional TV typically airs for a set duration, which naturally limits screen time and reduces the risk of overconsumption.

We’ve found that when students read something from a book, they tend to retain the information better than when they read the same content on a screen. We don’t fully understand why that is, but it does suggest that traditional learning methods still hold an important place.

That said, screens can be very helpful when used purposefully. For example, watching a video demonstration of a complex science experiment can be far more effective than trying to imagine it from a textbook. In classroom settings, it’s best when screens are used collectively, as part of a group lesson with discussion led by the teacher, rather than having each student isolate on their own individual device.

Yes, certain children are especially sensitive. Children with attention-deficit hyperactivity disorder, or ADHD, symptoms can become overstimulated by video games and may struggle even more with attention. Similarly, children experiencing anxiety or depression, or children who face social challenges may be more prone to negative effects from screen exposure, especially if they’re using it as an escape or replacement for in-person interaction.

In these cases, screen time should be monitored closely, and alternative, healthy outlets should be prioritized.

One of the most beneficial things parents can do is to ensure their children get at least two hours of physical activity each day, ideally outside. This supports not only their physical health but also their energy levels, focus and even vision.

Another important tip is to delay giving your child a smartphone for as long as possible. There’s a movement called “Wait Until 8th” that encourages parents to hold off until at least after eighth grade. The longer you can wait, the more time your child has to build a strong foundation of social and emotional development without the added pressures of smartphone use.