Well, I wouldn't. I'd get a device designed for a child or one that can create.
Back when all my friends had NES, Master System etc my folks bought me an Amiga. And instead of playing games all the time I used the art and music packages and that gave me a real good start. But I was around 5-6 at the time.
Hint: There are plenty of art and music apps available on the App store... The Piano in "Baby Apps" is one of her favorites right now.