I was just thinking of this today. We started letting ds2 watch bits of pbs kids in the morning, and I mean bits, like 5 minutes or so. He's always woken up badly, and needs time to just zone, and zoning to the tv a bit in the morning really helped; he'd then wake up gradually and be in a great mood. Anyway, with running my business and such, lately he watches about an hour or so in the morning; which really is fine with me. But, I do find that when he's really being challenging, or when we don't have anything to do, I do let him watch more than I think I should. My ds has always been "spirited". As long as we do things, particularly leaving the house (go outside, or go out to the store, for walks, etc) he's fine. But he really won't just play with toys, or do much interactive play- only for short bursts. Of course, he'd like to climb on me all day long, though
He really wants to be on the go. So, I've discovered that he will play better and longer if the tv is on in the background. I don't know why this is, but it is. So when the weather is bad and we can't go outside, I do "use" the tv to keep him entertained. We do other things, too, like read books and play and he uses me as a jungle gym; but I do let him watch alot. He watches PBS, or videos. Right now, for example, he is watching a Barney video, and also playing with ds1.
Also, he doesn't zone in front of the tv (except for about 10 minutes after waking in the morning and from his nap), he interacts and plays in front of it, if that makes sense.
I was really anti-tv, and I do struggle with it. But, my ds2 is smart, funny, and happy, and I don't feel that tv is harming him. I wish that he would play with his toys and do creative play more, but he doesn't. We've even gone tv free for a few weeks about a month ago, and that didn't make a difference.....he still didn't play much, he wanted to go go go go.
So, I'm not quite sure of my point, lol. If your dd doesn't need or want tv, I recommend not starting the habit
ETA my ds2 is 19mos now, and he started watching around 16mos