The rate of obesity among children and adolescents in the United States has nearly tripled between the early 1980s and 2000. It has however not changed significantly between 2000 and 2006 with the most recent statistics showing a level just over 17 percent.  In 2008, the rate of overweight and obese children in the United States was 32%, and had stopped climbing.  In 2011, a national cohort study of infants and toddlers found that nearly one-third of US children were overweight or obese at 9 months and 2 years old.  In a follow-up study, infant weight status (healthy and obese) was strongly associated with preschool weight status.