A new study showed that for every hour per day spent watching educational DVDs like Baby Einstein, infants understood 6-8 fewer words than those who did not watch them. Children with larger vocabularies had parents who read to them or told them stories.
The American Academy of Pediatrics recommends against watching television by children under 24 months.
There are at least 31 news reports on the story found on Google News but none of them links to the original source -- supposedly, an article in the Journal of Pediatrics. I checked the online version of the journal twice but I was still not able to find the study in question. After performing a PubMed search, it became clear the study was actually published in the Archives of Pediatrics & Adolescent Medicine and not in the Journal of Pediatrics.
Linking to the original source of the story should be one of the gold standards of the web journalism and it was obviously not done in this case.
DVDs Don't Produce Brainy Babies. U.S. News & World Report.
Baby Einsteins: Not So Smart After All. Time.
'Baby Einstein' Videos Ineffective, Study Finds. NPR (audio).
Audio: Study hits at the heart of Baby Einstein. MarketWatch.com.
Study: Babies Raised By Videos Approximately As Dumb As Expected. Gawker.com.