Oh, around 1 they start moving around and can actually do things. Before that they're just spuds. They sleep a lot, or they're fine sitting under one of those musical mobile things. Once they're about 1, though, they can move around, but there's nothing for them to really...do. They're too old to just sit and they're too young to play with (you can play along side of them, but they don't really understand 'play with' yet).
And there's little difference between the TV and the iPad, that was mostly a joke. There is one important difference, though. There are no commercials on Netflix, so my child has never seen an advertisement.