A new study published in the journal *Pediatrics* has found that children who begin using smartphones before the age of 12 face significantly higher risks of depression, obesity, and sleep disturbances. The research, part of the U.S.-based Adolescent Brain Cognitive Development (ABCD) study, tracked more than 10,000 participants aged 9 to 16 over several years. Findings show that early smartphone users were 30% more likely to experience depression, 40% more likely to develop obesity, and 60% more likely to suffer from poor sleep compared to peers without phones. Researchers noted that while smartphones can aid communication and safety, excessive use at a young age may disrupt mental, physical, and social development. The study suggests that prolonged screen exposure reduces physical activity, alters eating habits, and interferes with melatonin production, worsening sleep quality. Experts recommend delaying smartphone introduction until after age 12 to support healthier cognitive and emotional growth. The findings add to growing global concern about digital exposure among children and may influence future parental guidelines and education policies.