EMF or EMR exposure (same thing) is particularly bad for children. Here are a few excellent videos and sources on this.
https://www.activistpost.com/2019/04/who-says-no-screen-exposure-for-babies-under-1-year-old-kids-under-5-should-have-no-more-than-1-daily-hour-of-sedentary-screen-time.html
There are 3 videos on that page, all under 5 minutes and good.
https://www.activistpost.com/2018/11/psychologists-call-out-tech-industry-and-the-psychologists-they-hire-to-design-programs-to-hook-kids-on-tech.html
They are so devious.
https://www.activistpost.com/2018/11/silicon-valley-parents-spy-on-nannies-to-make-sure-they-arent-using-screens-around-their-kids-and-make-them-sign-no-screens-contracts.html
https://www.cbsnews.com/news/groundbreaking-study-examines-effects-of-screen-time-on-kids-60-minutes/
The California Department of Public Health (CDPH) issued a press release and guidelines on December 13, 2017 regarding the use of cell phones. Their guidelines described the effects on children and explained why they are greater than on adults.
https://www.cdph.ca.gov/Programs/CCDPHP/DEODC/EHIB/CDPH%20Document%20Library/Cell-Phone-Guidance.pdf