Accepted for Publication: February 6, 2013.
Published Online: July 29, 2013. doi:10.1001/jamapediatrics.2013.455.
Acquisition of data: Bellinger, Gillman, Oken.
Analysis and interpretation of data: Belfort, Rifas-Shiman, Kleinman, Guthrie, Bellinger, Taveras, Oken.
Drafting of the manuscript: Belfort.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Belfort, Rifas-Shiman, Kleinman, Guthrie.
Obtained funding: Belfort, Gillman, Oken.
Administrative, technical, and material support: Gillman.
Study supervision: Bellinger, Taveras, Gillman, Oken.
Conflict of Interest Disclosures: None.
Funding/Support: This work was supported by grants K23 DK083817 (Dr Belfort), K24 HL68041 (Dr Gillman), K24 HD069408 (Dr Oken), R01 ES016314, R01 HD34568, and R01 HL64925 from the National Institutes of Health.