Smartphones and Childhood: The Impact on Young Tweens
Recent studies are shedding light on how smartphones affect childhood, with findings from a new study focusing on young tweens on the brink of adolescence painting a concerning picture.
A team of researchers in the US discovered that owning a smartphone at the age of 12 was linked to a higher risk of depression, obesity, and insufficient sleep compared to not owning one.
The evolution of smartphones has been rapid, with the iPhone being introduced less than two decades ago. For many children entering their teenage years today, smartphones have always been a part of their lives. Studies like this aim to uncover the impacts of this constant connectivity.
Dr. Ran Barzilay, a child and adolescent psychiatrist at the Children’s Hospital of Philadelphia, emphasizes the importance of considering the potential health and life impacts when deciding to provide a child with a smartphone.
Key Findings from the Study:
- Ownership of a smartphone at age 12 was associated with an increased risk of depression, obesity, and insufficient sleep.
- Approximately 6.5% of 12-year-olds with phones were diagnosed with depression, compared to 4.5% without phones.
- 18% of smartphone users were obese, while only 12% of 12-year-olds without phones faced obesity.
- 47% of 12-year-olds with phones reported inadequate sleep, in contrast to 31% of those without phones.

Furthermore, children who acquired a phone by age 13 were more likely to experience mental health issues and inadequate sleep. However, there was no significant change in obesity risk over the following year.
While smartphones can have positive impacts, such as enhancing social connections and supporting learning, the researchers stress the need for responsible use of these devices.
The study does acknowledge some limitations, including the inability to establish causation in an observational study. Nonetheless, the strong associations observed warrant further investigation into the long-term effects of smartphone use on adolescent health.
The research aligns with existing knowledge about the impact of smartphones on adults, including increased stress levels and altered brain functioning.
Future studies will delve into the effects of screen time and different types of apps on health outcomes, as well as explore strategies to mitigate potential harms. Dr. Barzilay recommends allowing young people time away from their phones to engage in physical activities, which can safeguard against obesity and improve mental well-being over time.
The study has been published in Pediatrics and underscores the importance of understanding and managing the influence of smartphones on childhood development.

