A new report finds that nearly 2 in 5 children have used a mobile device before they could even speak a full sentence.
A study by Common Sense Media finds that 38 percent of children under the age of two have used a smartphone or tablet for playing games, watching videos, and other uses.
That's up from just 10 percent in 2011. And by the time kids turn 8 that number jumps to 72 percent.
