Updated: Oct 13, 2018
The American Academy of Pediatrics warns that overuse of digital media and screens can put children and teens at risk of obesity, sleep problems, cyberbullying and negative performance at school.
Just how much time are children spending buried in screens?
A report released this year by Common Sense Media said children up to age 8 spend an average of 2 hours and 19 minutes every day on screen media. The lion's share of that time is occupied by TV and video viewing alone; it takes up 72% of all screen time.

Moreover, the academy says that screen media use should not interfere with children's sleep and exercise routines.
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https://www.cnn.com/2017/11/15/health/screen-time-averages-parenting/index.html