My LO loves to watch snippets of the Wiggles. He dances around the room and talks while watching. He watches max 15 minutes a day. He may be only 14 months old but I really don't think it is harming him. In fact, I think it has been good for him because he now wakes up in the morning and sings to us (can't make out the words but know that is what he is doing). Agree with the other posts that everything in moderation and be selective. Too much of anything can be bad.