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That's cool. I ended up giving my 3GS to my 20 month old. She's been playing with it off and on since around 10 months old. I've loaded a few kids shows and apps on there. She loves looking through all the pictures on there. It's amazing how smart they are :)
 
My little cousin is 23 months old this month and he's definitely conditioned himself to the YouTube app.. he knows how to favorite and access said favorites. We'll start him on one Bob the Builder / Thomas the Tank Engine video and he'll plunge through the related videos and save some.. it's kind of creepy.
 
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