Investment in advertising for children is growing, but tight regulations mean that many demand-side platforms, including The Trade Desk and Yahoo, shy away from transacting on children’s inventory. As a result, some kids-focused publishers, such as HappyKids, are losing out on potential revenues of hundreds of millions of dollars annually. According to December data by…

(SOURCE) https://www.adweek.com/creativity/test_marketers-are-increasing-ad-spend-on-childrens-content-but-publishers-are-missing-out/