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As far as Christakis and his colleagues can determine, the only thing that baby videos are doing is producing a generation of overstimulated kids. “There is an assumption that stimulation is good, so more is better,” he says. “But that’s not true; there is such a thing as overstimulation.” His group has found that the more television children watch, the shorter their attention spans later in life. “Their minds come to expect a high level of stimulation, and view that as normal,” says Christakis, “and by comparison, reality is boring.”

He and other experts worry that the proliferation of these products will continue to displace the one thing that babies need in the first months of life — face time with human beings. “Every interaction with your child is meaningful,” says Christakis. “Time is precious in those early years, and the newborn is watching you, and learning from everything you do.” So just talk to them; they’re listening.