Is it good to let my baby watch Baby Einstein DVDs? He's 6 months old.

I wouldn't recommend letting babies watch TV, even though they are educational programs. Studies have shown that babies exposed to television (~1 or 2 hours per day) before the age of 2 consistently perform worse than their peers in language and motor skills tests. Moreover, when a baby watches TV, it takes away opportunities where the baby could have been conversing with its parent or playing with blocks or toys. http://healthland.time.com/2011/10/18/why-educational-tv-for-babies-doesnt-exist/