The cost of keeping American kids physically and mentally healthy increased 56 percent between 1996 and 2013, a new study finds. Health care expenditures jumped from nearly $150 billion in 1996 to more than $233 billion in 2013 for those 19 and younger, researchers found. Routine newborn care in the hospital accounted for the largest share of spending in 2013. Next highest were attention deficit hyperactivity disorder (ADHD) and routine dental care, including checkups and braces, the researchers said.