Because infants become so transfixed on the screen, they stop doing anything and everything else. Read more: https://health.clevelandclinic.org/electronic-toys-tv-can-infants-brain/?utm_source=marketo&utm_medium=email&utm_campaign=health+essentials+daily+tip+08-23-18&utm_content=Related&mkt_tok=eyJpIjoiWXpJMk16YzVOek5sT0dNMSIsInQiOiJNaWRwQjMrNmZ0RkhER1A5K0IzZ2RScE1Oa1Y0eUVSMWsxc1wvTnlmK0dYS0NZTVZnNnFpRTRydHU2WUp2RThmZ0Rwc05jZGRwNGJ6cmFqZm4yQ3U4akkrNkxaejNLOTNMNEhzWVVPSEt4MUNqbnJUSFp2NUFHelVsTlhtVzk2VEIifQ%3D%3D A new study scanned the brains of children 3 to 5 years old and found those who used screens more than the recommended one hour a day without parental involvement had lower levels of development in the brain's white matter. Read more: https://www.cnn.com/2019/11/04/health/screen-time-lower-brain-development-preschoolers-wellness/?utm_source=CNN+Health&utm_campaign=18b69bc900-EMAIL_CAMPAIGN_2019_11_05_02_11&utm_medium=email&utm_term=0_ddc799ed25-18b69bc900-99844689 US teens use screens more than seven hours a day on average -- and that's not including school work. Read more: https://www.cnn.com/2019/10/29/health/common-sense-kids-media-use-report-wellness/index.html?utm_source=CNN+Health&utm_campaign=18b69bc900-EMAIL_CAMPAIGN_2019_11_05_02_11&utm_medium=email&utm_term=0_ddc799ed25-18b69bc900-99844689