What Does Too Much Screen Time 

Do to Children’s Brains?

CHILD BEHAVIORAL EXPERT DR. JENNIFER CROSS EXPLAINS WHY SCREEN TIME SHOULD BE LIMITED FOR KIDS AND WHY SOME SCREENS ARE BETTER THAN OTHERS.

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Studies have shown that children under 2 learn less from a video than when learning from another person, and it appears that although children will watch the TV screen by 6 months, understanding the content does not generally occur until after age 2. It’s not that they won’t be captivated by what’s on the screen, but they’re not learning from it.

Language development expands rapidly between 1½ to 3 years of age, and studies have shown that children learn language best when engaging and interacting with adults who are talking and playing with them. There is also some evidence that children who watch a lot of television during the early elementary school years perform less well on reading tests and may show deficits in attention.

As humans, our circadian rhythms and our production of melatonin — the sleep hormone — kicks in when the sun sets. But the blue light from screens inhibits melatonin, which can delay sleep. And watching TV or playing games also keeps our brains and bodies more alert and activated and less ready for sleep. (Tablets and smartphones will suppress the melatonin more than TVs because the screen, and that blue light, is closer to the face.)

According to one study, infants 6 to 12 months old who were exposed to screens in the evening showed significantly shorter nighttime sleep than those who had no evening screen exposure.

For preteens and teenagers, excessive use of screens late at night will affect their sleep, and keeping screens out of the bedroom is advised. Too much time spent on social media as well as lack of sleep can affect behavior and cognitive performance in school and interfere with learning. It has also been shown that excessive screen time and sleep deprivation are linked to obesity, which in turn can affect self-esteem and lead to social isolation and more screen time.

The problem with mobile devices is that they draw you in, and as we all know it’s easy to waste time surfing the internet. They are also so portable and ubiquitous that we cannot manage without them. As adults, we understand some of the drawbacks and make a conscious decision to put the phone down, but for 2- or 3-year-olds, who don’t have any understanding of these concerns, if they have been exposed to the phone/tablet since infancy, it becomes their norm and they want to do more of it.

We should also be careful of relying on using screens to distract a child from a problem rather than having them figure it out and learn to resolve it themselves. Using a favorite song to distract a young child who has just fallen and scraped their knee might be OK, but having the parent comfort and cuddle with the child and talk to them is better. Using screen time to distract young children who are having trouble sharing a toy will not help them learn how to share and take turns in the future, although it may be a quick fix in the short term.

1. Co-watch whenever possible. If children are going to have screen time, the best thing you can do is to watch the show or game with them to help them understand what they’re seeing. Comment on things you notice, ask questions about what is happening, if someone on a show is singing a song, sing along with your child. Engage with them and repeat concepts after the show is over so they’re more likely to retain that information.

2. Choose media wisely. Look to organizations like Common Sense Media for reviews about age-appropriate apps, games, and programs to guide you in making the best choices for your children.

3. Keep bedtime, mealtime, and family time screen-free. Don’t use screens in the car except for long trips, and consider setting a curfew or an agreed-upon time when your family shuts off all screens. Balancing online and offline time is extremely important.

4. Limit your own phone use. Kids will do what they see their parents doing. At a young age, their parent(s) is the most important person in their life, so they will model whatever behavior they are seeing. If they see that you’re behind a screen all day every day, then they’ll see that it’s acceptable and will want to do the same.

5. Emphasize the big three: sleep, healthy nutrition, and exercise. All three are essential to optimal brain growth and development and health and wellness for children and adults alike. And excessive screen time can impact all three. Children who spend more time in front of screens have been shown to eat more fast food and less fruits and vegetables and get less sleep and exercise. Therefore, it is very important to incorporate healthy lifestyle choices as part of the daily routine, as well as limiting screen time.