Daycare is the next frontier in the fight against childhood obesity.

A new Harvard study found that only a few states require specific nutrition and physical activity for children under the age of 5 in daycare.

Now, health specialists say better nutrition and physical activity regulations are needed for preschoolers.

They recommend more physical activities and teaching kids about nutrition before they form bad eating habits.

One report last spring found that one in five American 4-year-olds are already obese.

And those rates are highest among American Indian, Hispanic and black children.