A group of Japanese scientists found that exposing 1-year-old babies to more screen time could lead to developmental delays in communication and problem-solving skills. According to the study, which was published in the Journal of the American Medical Association (JAMA) Pediatrics on Monday, 7,097 mother-child pairs were recruited from 50 obstetric clinics and hospitals across Miyagi and Iwate prefectures in Japan for the study. During the study, researchers asked the mothers to identify how much screen time they allow their 1-year-old children every day: none; less than one hour; one to less than two hours; two to less than four hours; or four or more hours.