14/12/2025
Kids with smartphones before 12 face higher risks of depression, poor sleep, and obesity.
A new study summarized by CBS News suggests that owning a smartphone before age 12 is linked to higher risks of depression, poor sleep, and obesity among young adolescents.
Drawing on data from more than 10,000 U.S. participants in the National Institutes of Health–funded Adolescent Brain Cognitive Development (ABCD) Study, researchers from Children’s Hospital of Philadelphia, the University of California, Berkeley, and Columbia University found that 63.6% of adolescents owned a smartphone, with a median acquisition age of 11.
The analysis indicated that the younger children were when they received their first smartphone, the greater their likelihood of reporting insufficient sleep and obesity, and that children without smartphones by age 12 had better mental health one year later, even after accounting for access to other devices like tablets.
Lead author Ran Barzilay emphasized that the study focused on the simple fact of smartphone ownership rather than specific types of use, raising questions about how merely having a device may shape health outcomes in early adolescence.
With smartphone ownership now nearly universal among teens and increasingly common among children as young as 5, the researchers plan to explore which patterns of use are most harmful or beneficial and to identify strategies—such as monitoring content and protecting sleep—to help families mitigate risks while preserving potential advantages.
References (APA style)
Czachor, E. M. (2025, December 1). Children who have smartphones by age 12 are at increased risk of health problems, new study finds. CBS News.
Barzilay, R., et al. (2025). Smartphone ownership, age of smartphone acquisition, and youth health outcomes. Pediatrics.