Yeah, the good thing is that most of the cartoons, series, movies, etc are translated to Spanish as well, so you have so many materials where to learn from. I would like to recommend just for you, not for your 3 year old, to check also some movies in original version in Spanish, in our blog we add movies often: http://www.123spanishtutor.com/category/spanish-movies/ Have a look and let us know what you think