Renee Giroux-Nix’s daughter, Bella, 3, plays games and uses educational apps on her mother’s iPhone, in Cedar Park, Texas, Oct. 10, 2010. Just as adults have a hard time putting down their iPhones, so the device is now the Toy of Choice, akin to a treasured stuffed animal, for many 1-, 2- and 3-year-olds, a phenomenon that is attracting the attention and concern of some childhood development specialists. (Ben Sklar/The New York Times) — PHOTO MOVED IN ADVANCE AND NOT FOR USE – ONLINE OR IN PRINT – BEFORE OCT. 17, 2010.
