Amazon is offering a special service for Kids ages 3-8 with unlimited content (books, games, apps, movies and TV shows) Kindle Free Time Unlimited
Kindle Free Time Unlimited is an optional extension to Kindle Free Time, that offers parents new tools like Time Limits and other parental controls.
Each kid in Amazon Free Time has his/her own profile and content area. Kids can explore all the content on their own and pick for themselves what to read, watch or play next. Favorite kids characters such Elmo, Dora, Thomas & Friends, Cinderella, Buzz Lightyear, Lightning McQueen and Curious George are part of the content package.
To help parents apps that have in-app payments, advertisements and social media removed. If a kid doesn't like the content, there is no extra payment. Amazon claims that All of the content is already pre-screened for age-appropriateness .
The well-reviewed Kindle Fire HD 
Free Time Unlimited will be available on the all-new Kindle Fire,