C.,
I hate to say it, but your pediatrician is right. The little ones shouldn't have the TV on so much of the day. I haven't heard of the link with Austism, but have read lots of studies on language development and TV/screen time.
My guys are just turned 4 and 2 years. We started letting them watch some (like 15-20 minutes) of TV around 20 months. Currently most days they watch about 1/2 hour of TV. Some days up to 45 minutes for the 2 year old (if they watch at two separate times during the day) and sometimes (like once a week) my 4 year old gets to watch a movie so he gets a longer stretch of time then.
We ONLY watch PBS or DVD's though, I think that a lot of the adult daytime tv and commercials that are aired during them are not appropriate for little kids.
I know it can be boring to not have the TV on during the day... I miss it sometimes (I kept it on a lot when my first was an infant and too little to pay attention to it), but with summer coming, maybe you can make a transition into doing other things instead of turning it on? The weather has to get better pretty soon, and when you get the urge to turn it on, maybe you can go outside instead... or go to story hour at your library, or even go shopping! Get out of the house! :)
Don't feel guilty about what you have done, but now that you know better, feel good about making changes that will be good for all of you.
Good luck!
jessica
SAHM to Charlie (4) Joey (2) and Rebecca (4 months).