Do instructional DVDs help babies learn? No.
A study used Baby Wordsworth DVDs (part of the Baby Einstein series), billed as a way to teach babies new words, and had a group of 12-to-24-month-olds watch them every day for six weeks.
The videos didn’t work, and there’s no difference in language acquisition between the children who watched the DVDs and the group who did not.
In fact, past analyses have found that infants who watch educational DVDs actually learn fewer words and score lower on certain cognitive tests by the time they reach preschool than kids who haven’t watched the videos.
More and more, it seems that television might not be great for little kids.