https://www.sciencedaily.com/releases/2018/10/181030091452.htm

But parents may not realize that while their little ones are learning letters and numbers or enjoying virtual adventures, they're also likely being targeted by advertisers.

Ninety-five percent of commonly downloaded apps marketed to or played by children ages 5 and under contain at least one type of advertising, according to a new study led by University of Michigan C.S. Mott Children's Hospital.