Touchscreen technology has so permeated our way of life that even babies expect pages to flick at the swipe of a finger. Steve's Job's intention with the iPad was that anyone could pick one up and use it, even a child, and if you've ever seen the glint in the eye of a child playing with the device it's clear that iPads are like crack to children.
For the 1 yr old in this video the iPad has been around her whole life. Paper? That's something old folks use.