Developed by Sikalosoft, Baby Shaker features a crude drawing of a baby, and the object of the game is to stop the baby from crying by shaking the iPhone until red X's appear over the baby's eyes. The description of Baby Shaker read: "On a plane, on the bus, in a theater. Babies are everywhere you don’t want them to be! They’re always distracting you from preparing for that big presentation at work with their incessant crying. Before Baby Shaker there was nothing you could do about it."

Patrick Donohue, founder of the Sarah Jane Brain Foundation (dedicated to children suffering from Pediatric Traumatic Brain Injury) was so upset with the app, he wrote a letter to Steve Jobs and other Apple executives.

"As the father of a three-year-old who was shaken by her baby nurse when she was only five days old, breaking three ribs, both collarbones and causing a severe brain injury, words cannot describe my reaction," said Donohue. "You have no idea the number of children your actions have put at risk by your careless, thoughtless and reckless behavior!"