WIC Infant and Toddler Feeding Practices Study–2 (ITFPS2)

OverviewThe WIC ITFPS-2 is a national, longitudinal study that examines feeding practices among caregivers and their children who participated in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) around the time of the child’s birth. The study explores:Breastfeeding practices and support.Early childhood feeding practices and transitions.Food and nutrient intakes of infants, toddlers, and young children.The impact of WIC services on feeding practices.Children’s weight status and early precursors of obesity.Environmental factors influencing nutrition outcomes.Factors associated with the duration of WIC participation.Behavioral and trend changes compared to the previous major study, WIC IFPS-1.Data were collected during the prenatal period and throughout the child’s first nine years of life at specific intervals, specifically at child ages 1, 3, 5, 7, 9, 11, 13, 15, 18, 24, 30, 36, 42, 48, 54, 60, and 72 months and at age 9 years.Study DesignType: Longitudinal cohort study.Duration: 2013–2023.Scale: Data collected from participants enrolled in 80 WIC sites across 27 State agencies.Respondents: Caregivers of children who received WIC services around birth.Data Collection MethodsSurvey Data: Telephone interviews with caregivers.Anthropometric Data: Children’s length/height and weight collected at WIC clinics or healthcare visits.Dietary Intake: Assessed using the USDA Automated Multiple Pass Method.Data CharacteristicsContent: Caregiver-level responses, child anthropometric data, derived analytic variables, and weights for national estimates.Privacy: No personally identifiable information included.Limitations: Subject to recall bias; see annual reports for details.Sampling precision: This dataset includes sampling weights that can be applied to produce national estimates.Resources AvailableITFPS2 Data Training ManualThis manual provides guidance for using the ITFPS2 data and planning analyses. It complements the survey instruments, data content files, codebooks, and dataset summaries. Topics include study design, sampling, file contents, naming conventions, missing values, derived variables, imputation, and statistical weights.File name: WIC_ITFPS-2_Year 9_Data_Training_Manual.pdfITFPS2 Annotated InstrumentsThis file includes all instruments used to conduct telephone interviews with study participants starting at enrollment and at child ages 1, 3, 5, 7, 9, 11, 13, 15, 18, 24, 30, 36, 42, 48, 54, 60, and 72 months and at age 9 yearsFile name: CompanionVolume-I-AnnotatedInstruments.pdfITFPS2 Public Use DataThis dataset contains key sociodemographic variables, derived variables, measurement data, WIC site composite scores, and interview data from the study enrollment through the Year 9 interviewCodebook: ITFPS2_EnrollTo9Y_PUF_Codebook.pdfData Contents: ITFPS2_EnrollTo9Y_PublicUse_DataContentsSAS: itfps2_enrollto9y_publicuse.sas7bdatITFPS2 ANA AMPMThis dataset contains detailed Automated Multiple Pass Method (AMPM) nutrition dataCodebook: AMPM_1mto9y_ANA_Codebook.pdfData Contents: AMPM_1mto9Y_ANA_DataContents.pdfSAS: ampm_1mto9y_ana.sas7bdatITFPS2 TOT AMPMThis dataset contains aggregate AMPM nutrition dataData Summary: AMPM_1mto9y_TOT_DataSummary.pdfData Contents: AMPM_1mto9Y_TOT_DataContents.pdfSAS: ampm_1mto9y_tot.sas7bdatITFPS2 Derived AMPMThis dataset contains data derived from the first recall in AMPM data, such as energy from different food sources and consumption of sweet foods and beverages at 24 months through year 9.Data Summary: AMPM_Derived_Age2to9_DataSummary.pdfData Contents AMPM_Derived_Age2to9_DataContents.pdfSAS: ampm_derived_age2to9.sas7bdatRelated MaterialsPrenatal through Ninth Year Study Reports