Is the Baby Einstein series a good developmental tool for infants? I've been showing my 3 month old son Baby Mozart everyday since he was 1 month old. He usually watches it quite passively, with an occasional squeak now and then. I have no idea if it is having a good effect on him or not? And I'm not sure if it's detrimental to show it to him over and over all the time. So, I wonder, how they came up with the content.

Also, are there any other good developmental toys / books / programs for 3 - 6 month old infants?