![]() The national study (NCT02031978) was approved by the Westat Institutional Review Board and the Office of Management and Budget, and local activities were approved by any state health department or local hospital institutional review boards associated with the WIC sites that required review. The study will follow children until age 6 y, but the current analysis focuses on data collected of the core sample through age 11 mo and both the core and supplemental samples between ages 13 and 24 mo. For both the core and supplemental samples, interviews were conducted by telephone in English or Spanish. Participants in the supplemental sample received ≤5 interviews at key points in time to ensure adequate sample size for specific characteristics. If selected for the core sample, participants received a prenatal interview and ≤10 postnatal interviews during the first 24 mo. WIC ITFPS-2 participants were enrolled in 1 of 2 samples: the core longitudinal sample or the supplemental sample.
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