Science
Too much screen time harms children, experts agree. So why do parents ignore them?
Parents are bombarded with a dizzying list of orders when it comes to screen time and young children: No screens for babies under 18 months. Limit screens to one hour for children under 5. Only “high-quality” programming. No fast-paced apps. Don’t use screens to calm a fussy child. “Co-view” with your kid to interact while watching.
The stakes are high. Every few months it seems, a distressing study comes out linking screen time with a growing list of concerns for young children: Obesity. Behavioral problems. Sleep issues. Speech and developmental delays.
Maya Valree, the mother of a 3-year-old girl in Los Angeles, understands the risks and constantly worries about them. But limiting her daughter’s screen time to one hour feels impossible as she juggles life as a working parent, she said.
Over the past few years, her child’s screen time has ranged up to 2-3 hours a day, more than double the limit recommended by pediatricians. Valree puts on educational programming whenever possible, but it doesn’t capture her child’s attention as well as her favorites, Meekah and “The Powerpuff Girls.”
“Screen time is in the top three or five things to feel guilty about as a mom,” she said. “I’ve used it to pacify my daughter while cooking or working or catching up on anything personal or professional.”
Maya Valree works while her 3-year-old daughter watches screen time on an iPhone on Saturday in Los Angeles.
(Zoe Cranfill / Los Angeles Times)
Valree is among the legions of parents who by choice or necessity allow their babies and preschoolers to watch several times more than the limit recommended by experts, creating a vast disconnect between the troubling predictions of harm and the reality of digital life for American families.
But her feelings of guilt may put Valree in the minority. Directives to limit the time young children spend on digital devices may not be taking root because many parents simply don’t believe their child’s screen time is a problem in the first place.
Parents need to have some type of distraction for their kids, and “screens tend to be the easiest option, the lowest hanging fruit,” said Dr. Whitney Casares, a Portland pediatrician and author of the book “Doing It All.” “I hear more people saying, ‘I know screen time is bad, I wish we had less of it in our family, but I feel helpless to change it.’”
Screen time use among older children made news last week, when the Los Angeles school board approved a cellphone ban all day on campus, and the U.S. surgeon general called for a warning on social media platforms advising parents that they can damage teenagers’ mental health.
Many families, however, support their children’s phone use for safety and education. For a generation of parents of who grew up with cellphones and computers, such sentiments appear to start with much younger children. A national survey of families with children 8 and younger found that the majority of parents believe screen time is a net positive — helping their children learn to read, boosting creativity and even improving their social skills.
Should children under 5 have screen time?
The American Academy of Pediatrics recommends families avoid screens for babies under 18 months, with the exception of video chatting. Parents who want to introduce digital media to toddlers ages 18-24 months should keep it very limited, choose high-quality educational programming, always watch alongside their children, and interact with their children both during and after watching.
For children ages 2-5, pediatricians recommend limiting screen time to one hour a day of high-quality programming that is educational, interactive and pro-social with few or no advertisements. Parents should avoid fast-paced programs, apps with distracting content and anything with violence. Whenever possible, they should co-view with their children to help them understand what they are seeing.
Maya Valree’s 3-year old daughter watches screen time on an iPhone while her mother works on Saturday, June 22, 2024 in Los Angeles, CA.
(Zoe Cranfill/Los Angeles Times)
Pediatricians also recommend that children avoid screens during mealtimes and at least one hour before bedtime. When no one is watching the TV, it should be turned off. And parents should avoid regularly using screens to calm their child, because it can make it difficult to set limits and teach children to regulate their own emotions.
“We don’t want to be the scolds. It’s our job to provide information to parents but to also say we understand the reality of everyone’s current lifestyle. It’s just a different world now,” said Dr. Nusheen Ameenuddin, one of the authors of the academy’s policy statement. “[Parents] aren’t going to be perfect 100% of the time.”
Jacqueline Nesi, an assistant professor of psychiatry at Brown University and author of Techno Sapiens, said screen time limits need to be a balance. While there is evidence that endless screen time — especially more than four hours a day — can be harmful, Nesi said there aren’t data to support a strict one-hour cutoff.
“As parents we know life isn’t always aligned with the recommendations. We don’t want to throw them away, but we also don’t want to be in a place where we’re demonizing all screen time.”
What percentage of parents limit their kids’ screen time?
The most recent data available come from a national survey of nearly 1,500 families with children ages 8 and younger conducted by Common Sense Media in 2020, just weeks before the pandemic closures began. The survey found that few families were coming anywhere close to pediatricians’ recommended limits.
- Children under 2 watch an average of 49 minutes of digital media a day, while the guidelines recommend avoiding screens for children under 2.
- Children ages 2-4 watch an average of 2.5 hours a day, more than twice the limit recommended.
- Children 5-8 watch just over three hours a day. The American Academy of Pediatricians does not provide strict time limits for school-aged children but advises parents to make sure screen time does not displace other activities.
The majority of parents surveyed reported that they’re not concerned about the amount of time their kids spend with screens, the impact screen media have on their child or the quality of the content available to them. The survey also asked about the reasons for children’s screen use: More than three-quarters of parents said “learning” was very or somewhat important, and more than half said parents need “time at home to get things done.”
For a generation of parents who grew up with cell phones and computers, letting kids indulge in a bit of phone or TV time doesn’t feel like a big deal.
Henja Flores, a mother of three in Fresno, said videos from YouTube sensation Ms. Rachel taught her toddler sign language and the ABC’s. “I use it as an educational thing, but also if I have to make lunch or dinner,” she said. She’s seen the headlines, but she lets her children watch two to three hours a day, as long as the shows don’t seem too overstimulating.
“I just don’t think it’s something parents need to stress about. Moms need breaks. Moms needs to get things done. As long as it’s helping, I don’t think there’s anything wrong with it at all,” said Flores.
The Common Sense survey found screen habits varied by income level, race and ethnicity. In lower-income families, for example, children were watching an average of two more hours each day than those in higher-income families.
“For lower-income families there are going to be bigger barriers to limiting screen time. It takes a lot of time and work. Higher-income families are more likely to have high quality child care, which is very expensive in our country,” said Nesi. “Sometimes screen time is serving as that thing that’s going to keep your kid occupied and safe.”
Black parents and those in lower-income households were also much more likely than their higher-income or white counterparts to perceive educational benefits to their children from screen media. Latino parents, meanwhile, had the highest level of concern about the possible negative effects of media in their children’s futures.
Why do pediatricians want to limit children’s screen time?
The strongest evidence for avoiding excessive screen times involves the “opportunity cost” — the valuable learning opportunities children miss out on during the hours they spend on digital devices.
In order to develop cognitive, language, motor and social-emotional skills, young children need to experience the world hands-on — playing with toys, exploring outside, experimenting with different materials, and having back-and-forth interactions with nurturing caregivers, said Ameenuddin. When they are watching digital media, they lose that time to grow and learn.
Maya Valree’s 3-year old daughter plays with a toy laptop and watches a video while her mother works on Saturday, June 22, 2024 in Los Angeles, CA.
(Zoe Cranfill/Los Angeles Times)
This is particularly true for babies and toddlers, because there isn’t much evidence that they can learn through screens.
For preschoolers, there’s more evidence that educational shows like “Sesame Street” can help improve literacy and social development, but only in limited amounts. Heavy media use in the early years has been linked to a greater risk of obesity because these children often miss out on physical activity and outdoor time. They’re also more like to see advertisements for sugary foods and drinks.
Children who are watching screens also have fewer valuable interactions with caregivers and hear fewer words during the course of their days, which is linked to cognitive, language and social delays. Some studies have found evidence linking excessive screen time with behavioral issues such as ADHD, though the research did not show that one was actually caused by the other.
A bigger question is whether the screen time is changing the wiring of babies’ and young children’s brains. A small MRI study of preschoolers found that children who watched more than the recommended one hour a day had lower development in the brain’s white matter that supports language and early literacy skills. But Ameenuddin says the evidence isn’t clear yet that screens themselves are affecting brain development.
Is screen time harmful for babies?
Babies should be playing and exploring the world, not watching screens, experts advise.
In the first three years of life, more than 1 million neural connections are formed every second, and key to this development are the “serve and return” interactions between children and their caregivers, according to Harvard’s Center for the Developing Child. Babies babble and make faces and gestures, and the people who love them respond in kind. Without these important interactions, the brain’s architecture can’t form the way it should.
These sorts of interactions don’t happen through screens.
A recent Japanese study found that the more time a baby spent watching screens at age 1, the more likely they were to have developmental delays in communication and problem-solving at ages 2-4 — particularly when they watched more than four hours a day.
But Nesi, the psychiatry professor, said there’s no need to shield a baby’s eyes when in a room with a television on. “There’s a lot of fear messaging around this, and there’s no evidence to suggest that your baby catching a glance of a screen every once in a while could do harm.”
How can I make the most of screen time?
“There is a lot of incredible, cool stuff for kids to watch and do on screens,” said Jill Murphy, chief content officer at Common Sense Media, which offers quality ratings and media reviewsfor children. In general, Murphy says it’s safer to stick with branded content from a production company that’s intended for young children, which often have child development staff or advisors.
YouTube Kids requires more parental guidance, she said, and parents need to evaluate videos in advance. If they can’t, they should create a profile with a child’s selected interests and a set number of videos coming into the feed.
“Anything violent is a hard no for young kids, even if it’s play slapping or hitting each other with a stick,” said Murphy. “They’re very quick to mimic that behavior.”
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Researchers recommend age-appropriate programming that actively involves children by asking them questions, helps them make meaningful connections to their everyday lives, and includes “socially meaningful” characters they can get to know rather than a disembodied voice.
Murphy says parents should designate screen-free zones and times, and set clear limits around when screen time will end. And whenever possible, stick with high-quality educational content without commercials, like the kind found on PBS Kids, which has been found to lead to better behavioral outcomes and language skills.
Set boundaries, avoid screens around bedtime, and whenever possible, watch alongside your child.
This article is part of The Times’ early childhood education initiative, focusing on the learning and development of California children from birth to age 5. For more information about the initiative and its philanthropic funders, go to latimes.com/earlyed.
Science
Lyrids Meteor Shower: How to Watch, Peak Time and Weather Forecast
Our universe might be chock-full of cosmic wonder, but you can observe only a fraction of astronomical phenomena with the naked eye. Meteor showers, natural fireworks that streak brightly across the night sky, are one of them.
The latest observable meteor shower will be the Lyrids, which has been active since April 14 and is forecast to continue through April 30. The shower reaches its peak April 21 to 22, or Tuesday night into Wednesday morning.
According to NASA, the Lyrids are one of the oldest known meteor showers, and have been enjoyed by stargazers for nearly 3,000 years. Their bright, speedy streaks are caused by the dusty debris from a comet named Thatcher. They appear to spring from the constellation Lyra, which right now can be seen in the eastern sky at night in the Northern Hemisphere.
The moon will be about 27 percent full tonight, appearing as a thick crescent in the sky, according to the American Meteor Society.
To get a hint at when to best watch for the Lyrids, you can use this tool, which relies on data from the Global Meteor Network. It shows fireball activity levels in real time.
And while you gaze at the heavens, keep an eye out for other stray meteors streaking across the night sky. Skywatchers are reporting that the amount of fireballs is double what is usually seen by this point in the year.
Where meteor showers come from
There is a chance you might see a meteor on any given night, but you are most likely to catch one during a shower. Meteor showers are caused by Earth passing through the rubble trailing a comet or asteroid as it swings around the sun. This debris, which can be as small as a grain of sand, leaves behind a glowing stream of light as it burns up in Earth’s atmosphere.
Meteor showers occur around the same time every year and can last for days or weeks. But there is only a small window when each shower is at its peak, which happens when Earth reaches the densest part of the cosmic debris. The peak is the best time to look for a shower. From our point of view on Earth, the meteors will appear to come from the same point in the sky.
The Perseid meteor shower, for example, peaks in mid-August from the constellation Perseus. The Geminids, which occur every December, radiate from the constellation Gemini.
How to watch a meteor shower
Michelle Nichols, the director of public observing at the Adler Planetarium in Chicago, recommends forgoing the use of telescopes or binoculars while watching a meteor shower.
“You just need your eyes and, ideally, a dark sky,” she said.
That’s because meteors can shoot across large swaths of the sky, so observing equipment can limit your field of view.
Some showers are strong enough to produce up to 100 streaks an hour, according to the American Meteor Society, though you probably won’t see that many.
“Almost everybody is under a light-polluted sky,” Ms. Nichols said. “You may think you’re under a dark sky, but in reality, even in a small town, you can have bright lights nearby.”
Planetariums, local astronomy clubs or even maps like this one can help you figure out where to go to escape excessive light. The best conditions for catching a meteor shower are a clear sky with no moon or cloud cover, sometime between midnight and sunrise. (Moonlight affects visibility in the same way as light pollution, washing out fainter sources of light in the sky.) Make sure to give your eyes at least 30 minutes to adjust to seeing in the dark.
Ms. Nichols also recommends wearing layers, even during the summer. “You’re going to be sitting there for quite a while, watching,” she said. “It’s going to get chilly, even in August.”
Bring a cup of cocoa or tea for even more warmth. Then lie back, scan the sky and enjoy the show.
Where weather is least likely to affect your view
Storm systems sweep across the country in early spring, and some will be obscuring skies tonight. But there will still be plenty of areas with clear skies, particularly in parts of the central United States.
“The best spot is going to be in the Upper Midwest,” said Rich Bann, a meteorologist with the Weather Prediction Center.
Minnesota, Wisconsin and Iowa will offer especially good sky-viewing weather and a beach on the Great Lakes could be a nice spot to look up at the stars.
But don’t expect to view the show from Chicago, as Illinois could see some thunderstorms. The weather will be better in the Northern and Central Plains, particularly the eastern Dakotas.
High, wispy clouds are expected over the Ohio and Tennessee Valleys and into parts of the Mid-Atlantic. But, Mr. Bann said, “you may be able to see some shooting stars through thin clouds.”
Clouds will be draped across much of the Southeast and the Northeast, though there could be some clearing in Florida, Georgia, the Carolinas and Virginia. Remember, the meteors could be visible all night long. If you look outside and see clouds, try again later.
Catching the spectacle will be challenging across much of the West, particularly from Washington into Northern California, where a storm system is bringing rain and snow. That system will move east overnight.
There are likely to be some pockets of clear skies at times across southern Nevada, northwest Arizona and southwest Utah, Mr. Bann said.
Amy Graff contributed reporting.
Science
FBI probes cases of missing or dead scientists, including four from the L.A. area
WASHINGTON — Amid growing national security concerns, the FBI said Tuesday that it has launched a broad investigation in the deaths or disappearances of at least 10 scientists and staff connected to highly sensitive research, including four from the Los Angeles area.
“The FBI is spearheading the effort to look for connections into the missing and deceased scientists. We are working with the Department of Energy, Department of War, and with our state and state and local law enforcement partners to find answers,” the agency said in a statement.
The FBI’s announcement comes after the House Oversight Committee announced that it would investigate reports of the disappearance and deaths of the scientists, sending letters seeking information from the agencies involved in the federal inquiry as well as NASA, which owns the Jet Propulsion Laboratory in La Cañada Flintridge, where three of the missing or dead scientists worked.
“If the reports are accurate, these deaths and disappearances may represent a grave threat to U.S. national security and to U.S. personnel with access to scientific secrets,” Reps. James Comer (R-Ky.), chairman of the committee, and Eric Burlison (R-Mo.) wrote in the letters.
President Trump told reporters last week that he had been briefed on the missing and dead scientists, which he described as “pretty serious stuff.” He said at the time that he expected answers on whether the deaths were connected “in the next week and a half.”
Michael David Hicks, who studied comets and asteroids at JPL, was the first of the scientists who disappeared or died. He died on July 30, 2023, at the age of 59. No cause of death was disclosed.
A year later, JPL physicist Frank Maiwald died at 61, with no cause of death disclosed.
Two other Los Angeles scientists are part of the string of deaths and disappearances.
On June 22, 2025, Monica Jacinto Reza, a materials scientist at JPL, disappeared while on a hike near Mt. Waterman in the San Gabriel Mountains.
On Feb. 16, Caltech astrophysicist Carl Grillmair was fatally shot on the porch of his Llano home. The Los Angeles County Sheriff’s department arrested Freddy Snyder, 29, in connection with the shooting. Snyder had been arrested in December on suspicion of trespassing on Grillmair’s property.
Snyder has been charged with murder.
There is no evidence at this point that the deaths and disappearances, which occurred over a span of four years, are connected.
A spokesperson for NASA, which owns JPL, said in a statement on X that the agency is “coordinating and cooperating with the relevant agencies in relation to the missing scientists.
“At this time, nothing related to NASA indicates a national security threat,” agency spokesperson Bethany Stevens wrote. “The agency is committed to transparency and will provide more information as able.”
Representatives from Caltech, which manages JPL, did not immediately respond to a request for comment.
Science
What’s in a Name? For These Snails, Legal Protection
The sun had barely risen over the Pacific Ocean when a small motorboat carrying a team of Indigenous artisans and Mexican biologists dropped anchor in a rocky cove near Bahías de Huatulco.
Mauro Habacuc Avendaño Luis, one of the craftsmen, was the first to wade to shore. With an agility belying his age, he struck out over the boulders exposed by low tide. Crouching on a slippery ledge pounded by surf, he reached inside a crevice between two rocks. There, lodged among the urchins, was a snail with a knobby gray shell the size of a walnut. The sight might not dazzle tourists who travel here to see humpback whales, but for Mr. Avendaño, 85, these drab little mollusks represent a way of life.
Marine snails in the genus Plicopurpura are sacred to the Mixtec people of Pinotepa de Don Luis, a small town in southwestern Oaxaca. Men like Mr. Avendaño have been sustainably “milking” them for radiant purple dye for at least 1,500 years. The color suffuses Mixtec textiles and spiritual beliefs. Called tixinda, it symbolizes fertility and death, as well as mythic ties between lunar cycles, women and the sea.
The future of these traditions — and the fate of the snails — are uncertain. The mollusks are subject to intense poaching pressure despite federal protections intended to protect them. Fishermen break them (and the other mollusks they eat) open and sell the meat to local restaurants. Tourists who comb the beaches pluck snails off the rocks and toss them aside.
A severe earthquake in 2020 thrust formerly submerged parts of their habitat above sea level, fatally tossing other mollusks in the snail’s food web to the air, and making once inaccessible places more available to poachers.
Decades ago, dense clusters of snails the size of doorknobs were easy to find, according to Mr. Avendaño. “Full of snails,” he said, sweeping a calloused, violet-stained hand across the coves. Now, most of the snails he finds are small, just over an inch, and yield only a few milliliters of dye.
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