This supplemental issue of Pediatrics presents the first set of results from the Infant Feeding Practices Study II (IFPS II), which were chosen to cover a wide range of the topics included in the study. The IFPS II was conducted collaboratively by the Food and Drug Administration and the Centers for Disease Control and Prevention (CDC) and was co-funded by other agencies in the Department of Health and Human Services, as indicated in “Acknowledgments.”

The design of the IFPS II was similar to that of the original study (the IFPS I), which was conducted in 1992–1993. In the current longitudinal survey, a large cohort of 4900 women was enrolled prenatally, and >2000 were followed through the first year of their infant's life. The mothers were mailed 1 prenatal and 10 postnatal questionnaires at approximate monthly intervals; in addition, prenatal and postnatal subsamples were administered a dietary intake questionnaire. The questionnaires...

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