Children and parents: media use and attitudes report 2018 Ofcom
This report examines children’s media literacy. It provides detailed evidence on media use, attitudes and understanding among children and young people aged 5-15, as well as about the media access and use of young children aged 3-4.
The report also includes findings relating to parents’ views about their children’s media use, and the ways that parents seek – or decide not – to monitor or limit use of different types of media.
Also, Here's the BBC's summary of findings which may be easier to read.