Many children worldwide spend a considerable amount of time with media. However, children's exposure to advertising may differ as a reflection of different public policies enforced around the world. Many policies worldwide place limits on the amount of advertising permitted, yet concerns rise about the nature of the messages (whether few or many) that children encounter. Therefore, this literature review will examine advertising messages that appear in children's media environments, focusing on television content and then exploring advertising in new media, specifically online advertising. Content analyses of electronic advertising reflect the interplay between public policy, industry self‐regulation, and marketplace forces. As such, the United States provides an example of how these three forces operate together and is the focus of this review.