I am not a Dr, nor do I play one on tv, so I really do not have a medical stake in this topic, other than stating my opinion, so here goes.
I think that children watching tv can be healthy, but to a point. I can see a lot of benefits from certain tv shows ,whether they talk about the importance of being friends and helping your neighbors or learning to speak multiple languages. But, in saying that, I think that there needs to be moderation. Too many people use TV as a babysitter, so just be careful and monitor what your kids are watching and the amount of time that they are in front of the tv.
So parents, if you choose to let your children watch tv, that is your decision, but just monitor what they are watching and for how long. I would much rather sit in the floor and play with my boys, then sit on the sofa and let the tv interact with them.