Author Contributions: Dr Pan had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Pan, Sherry, Dalenius, Grummer-Strawn.
Acquisition of data: Dalenius, Grummer-Strawn.
Analysis and interpretation of data: Pan, Blanck, Dalenius, Grummer-Strawn.
Drafting of the manuscript: Pan.
Critical revision of the manuscript for important intellectual content: Pan, Blanck, Sherry, Dalenius, Grummer-Strawn.
Statistical analysis: Pan, Grummer-Strawn.
Administrative, technical, or material support: Grummer-Strawn.
Study supervision: Blanck, Sherry.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Disclaimer: The findings and conclusions of this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.
Additional Contributions: The data used in this study were collected by the state Special Supplemental Nutrition Program for Women, Infants, and Children grantees and the California Child Health Disability Prevention Program. We gratefully acknowledge David S. Freedman, PhD, Deborah A. Galuska, PhD, Ashleigh L. May, PhD, and Barbara Polhamus, PhD, MPH, RD (all with the Centers for Disease Control and Prevention), for assisting in the preparation and revision of this research letter. None received compensation for their contributions.