PARIS - Twenty-two-month-old George sits on a tiny blue chair, at a baby-sized desk, playing with a grown-up toy - an iPad, sign of a powerful trend that has set alarm bells ringing among child development experts.

Leaning over the tablet, the little Parisian finger-stabs the duck icon on "Moo Box", an application with animal images that let out moos, oinks and barks.

For his mother Aurelie Mercier, 32, the beauty of iPad apps is they can expand her son's world, like a virtual piano that lets him play music in the absence of the real thing.

"It's a window onto tons of things that we don't have at home and that can be condensed into a very small object," she told AFP.

Fuelled by the likes of George, the number of baby and toddler apps is booming, according to Heather Leister who has reviewed child applications at US website theiphonemom.com since 2009.

But psychologists and parents are divided on putting smartphones and tablets into such young hands, a high-stakes issue considering how pivotal the first couple of years are to child development.

Experts at a panel discussion in New York last month entitled "Baby Brains and Video Games" urged parents to set limits on electronic device use - while acknowledging the magnetic appeal of iPads in particular.

"You can't pull it from their hands," said panelist Warren Buckleitner, editor of the Children's Technology Review.

George, who spends a half hour per week with the iPad, first asked for it at 10 months by pointing and cooing in its direction.

Both graphic artists, his parents recently developed their first app, which generates firework-like images to save as screenshots.

Though geared toward adults, Mercier lets George play with it, talking softly as he sends yellow stars swirling around the screen.