Half of American children under eight now have access to mobile devices like iPhones and iPads. The American Academy of Pediatrics recommends no screen time for children under two, but numbers suggest they too are being increasingly exposed to television, computers and mobile devices.

A Common Sense Media report found another unexpected outcome of this phenomenon, what they are calling "the app gap": while half of the high-income parents surveyed have downloaded some form of mobile application for their children, one-third of lower-income parents do not know what an app is.

Al Jazeera's Kristen Saloomey reports from New York.