Effects of TV and videos on babys

http://en.wikipedia.org/wiki/Baby_Einstein
Controversy over effects on language development
In August 2007, the Journal of Pediatrics published a preprint version of the results of a study by researchers at the University of Washington on the effects of television and DVD/video viewing on language development in children under two years of age. The study, the second conducted by the same researchers as part of a larger project, was a correlational study based on telephone interviews with parents of children aged 2 to 24 months.
The study's authors, Drs. Frederick Zimmerman, Dimitri Christakis, and Andrew Meltzoff, concluded that, among infants aged 8 to 16 months, exposure to "baby DVDs/videos" — such as Baby Einstein and Brainy Baby — was strongly associated with lower scores on a standard language development test. This result was specific to baby-oriented educational videos and did not hold for other types of media, and was not related to shared parental viewing. Among toddlers aged 17 to 24 months, the study found no significant effects, either negative or positive, for any of the forms of media that were viewed. Daily reading and storytelling, however, were found to be associated with somewhat higher language scores, especially for toddlers.[10]
The University of Washington press release announcing the study explained that for each hour-per-day spent watching baby DVDs/videos, infants understood on average six to eight fewer words than infants who did not watch them, and recommended that parents limit their use. "There is no clear evidence of a benefit coming from baby DVDs and videos and there is some suggestion of harm," said lead author Frederick Zimmerman. "We don't know for sure that baby DVDs and videos are harmful, but the best policy is safety first. Parents should limit their exposure as much as possible."[11]
Christakis, a pediatrician, said that he is "frequently asked by parents what the value of these products is," and stated, "The evidence is mounting that they are of no value and may in fact be harmful. Given what we now know, I believe the onus is on the manufacturers to prove their claims that watching these programs can positively impact children's cognitive development."[12]
In response to the negative media reports generated by the study and the press release, the Baby Einstein Company issued the following statement: