One in seven American children aged 2 to 8 suffers from a mental, behavioral or developmental problem, federal health officials report. Researchers analyzed data supplied by parents in the 2011-2012 National Survey of Children's Health, looking for reported speech and language problems, learning disabilities, attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder, anxiety and more. "Based on the number of kids affected, this is something we need to pay attention to," said lead researcher Jennifer Kaminski, team leader for child development studies at the U.S. Centers for Disease Control and Prevention (CDC).