Childhood obesity is on the decline in at least 18 states, according to the Centers for Disease Control and Prevention.
"The tide has begun to turn for some kids in some states," CDC director Thomas Frieden said Tuesday. "While the changes are small, for the first time in a generation they are going in the right direction."
Still, CDC officials warn that rates are still too high.
One in eight preschoolers in the United States is obese. They're five times more likely than other children to be heavy as adults.
That means they're at greater risk for high cholesterol, high blood sugar, asthma, and even mental health problems.
Meanwhile, programs like first lady Michelle Obama's "Let's Move" initiative are being credited with the drop in the number of kids who are overweight.
"We know how essential it is to set our youngest children on a path toward a lifetime of healthy eating and physical activity," Mrs. Obama said in a statement. "More than 10,000 child care programs participating in the Let's Move! Child Care initiative are doing vitally important work on this front."