 A series of measurements will be collected on participating children, parents, and child care providers at two time points - baseline and follow-up. Primary outcomes measures will assess child physical activity and diet quality. Secondary outcomes measures will assess child weight, center and home environment. These measures will be collected in large part during two-day on-site visits to the child care center, and supplemented with self-administered surveys. Center visits will be conducted by data collectors who have undergone extensive training and certification on all measurement procedures and are blinded to study-arm assignment. Identical data collection protocols will be used at baseline and follow-up. 