A recent study, which appeared in the Archives of Pediatric and Adolescent Medicine, found once again that television watching for infants and toddlers is not only not educational, it may even stunt their development.  One specific finding from this study  concluded that babies who watch TV are more likely to have delayed cognitive development and language at 14 months, especially if they’re watching programs intended for adults and older children. 

http://health.yahoo.net/articles/parenting/tv-watching-bad-babies-brains