This Baby Reading ad. just scares me. Reading is one thing, learning some sight words quite another. MY DS8 was a very early reader (2 1/2), but that was because he was obsessed with books the way my other kids were with trains and animals. He would constantly be bringing books to me (it would drive me nuts a lot of the time) and 'demand' to be read to. He just loved the stories and jokes etc. and started figuring out words for himself.
Now I do believe reading is sometimes left too late. Just like foreign languages, some things can be left too late to be absorbed easily, but sticking a bunch of sight words in front of a baby is not what a baby needs.