Anything I have ever read or heard say children should not be watching any tv for the first 2 years of their life!
Apparently the colours, movements, noise etc is over-stimulating and is a cause of A.D.D or A.D.H.D and whatever else.
I know people that sit their kids from so young infront of a dvd for HOURS.
One child inparticular is 5 or 6 now... spent years in front of the tv. Parents are young and kinda lazy and use tv as a baby sitter. Now he has very little imagination. He can't sit an colour or draw... once i saw him watch Ice Age 4 times in a row!

I'm not a parent yet. =( So i'm in no position to judge.
Just sharing what i've heard.