My kid is now two years old and has been using an iPhone or iPad since a little earlier than one.
There are plenty of things they learn by using these devices -- fine motor control, color and shape recognition.
This is definitely a good thing and these people that are alarmists about these new devices are being ridiculous.
Yeah -- limit access to the device, don't let them sleep with it and play with it all day -- but they are fine for ten minutes at a time.
I think the first app that was useful to my son was a drum app. a flash card app that showed a picture and spoke its name were
favorites for a long time (there were various a year ago, Food, Vehicles, Everyday Objects). Then a drawing apps and now number and
Books have been popular -- Sandra Boynton books and Dr. Suess mostly