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WIC Infant and Toddler Feeding Practices Study-2 (WIC ITFPS-2): Prenatal, Infant Year, Second Year, Third Year, and Fourth Year Datasets

dataset
posted on 2024-02-16, 22:10 authored by USDA Food and Nutrition Service, Office of Policy Support

[2023-05-04 - Added WIC Infant and Toddler Feeding Practices Study-2 Data File Training Manual]

The WIC Infant and Toddler Feeding Practices Study–2 (WIC ITFPS-2) (also known as the “Feeding My Baby Study”) is a national, longitudinal study that captures data on 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 addresses a series of research questions regarding feeding practices, the effect of WIC services on those practices, and the health and nutrition outcomes of children on WIC. Additionally, the study assesses changes in behaviors and trends that may have occurred over the past 20 years by comparing findings to the WIC Infant Feeding Practices Study–1 (WIC IFPS-1), the last major study of the diets of infants on WIC. This longitudinal cohort study has generated a series of reports. These datasets include data from caregivers and their children during the prenatal period and during the children’s first four years of life (child ages 1 to 48 months).

A full description of the study design and data collection methods can be found in Chapter 1 of the Second Year Report (https://www.fns.usda.gov/wic/wic-infant-and-toddler-feeding-practices-study-2-second-year-report). A full description of the sampling and weighting procedures can be found in Appendix B-1 of the Fourth Year Report (https://fns-prod.azureedge.net/sites/default/files/resource-files/WIC-ITFPS2-Year4Report-Appendix.pdf).

Processing methods and equipment used Data in this dataset were primarily collected via telephone interview with caregivers. Children’s length/height and weight data were objectively collected while at the WIC clinic or during visits with healthcare providers. The study team cleaned the raw data to ensure the data were as correct, complete, and consistent as possible.

Study date(s) and duration Data collection occurred between 2013 and 2018.

Study spatial scale (size of replicates and spatial scale of study area) Respondents were primarily the caregivers of children who received WIC services around the time of the child’s birth.

Level of true replication Unknown

Sampling precision (within-replicate sampling or pseudoreplication) This dataset includes sampling weights that can be applied to produce national estimates. A full description of the sampling and weighting procedures can be found in Appendix B-1 of the Fourth Year Report (https://fns-prod.azureedge.net/sites/default/files/resource-files/WIC-ITFPS2-Year4Report-Appendix.pdf).

Level of subsampling (number and repeat or within-replicate sampling) A full description of the sampling and weighting procedures can be found in Appendix B-1 of the Fourth Year Report (https://fns-prod.azureedge.net/sites/default/files/resource-files/WIC-ITFPS2-Year4Report-Appendix.pdf).

Study design (before–after, control–impacts, time series, before–after-control–impacts) Longitudinal cohort study.

Description of any data manipulation, modeling, or statistical analysis undertaken Each entry in the dataset contains caregiver-level responses to telephone interviews. Also available in the dataset are children’s length/height and weight data, which were objectively collected while at the WIC clinic or during visits with healthcare providers. In addition, the file contains derived variables used for analytic purposes. The file also includes weights created to produce national estimates.

The dataset does not include any personally-identifiable information for the study children and/or for individuals who completed the telephone interviews.

Description of any gaps in the data or other limiting factors Please refer to the Second Year Report (https://www.fns.usda.gov/wic/wic-infant-and-toddler-feeding-practices-study-2-second-year-report) for a detailed explanation of the study’s limitations.

Outcome measurement methods and equipment used The majority of outcomes were measured via telephone interviews with children’s caregivers. Dietary intake was assessed using the USDA Automated Multiple Pass Method (https://www.ars.usda.gov/northeast-area/beltsville-md-bhnrc/beltsville-human-nutrition-research-center/food-surveys-research-group/docs/ampm-usda-automated-multiple-pass-method/). Children’s length/height and weight data were objectively collected while at the WIC clinic or during visits with healthcare providers.

See file list for descriptions of each data file.

Funding

USDA: Contract No. AG-3198-B-11-0020

History

Data contact name

USDA FNS OPS

Data contact email

OpsDataRequests@usda.gov

Publisher

USDA FNS Office of Policy Support

Intended use

The U.S. Department of Agriculture’s (USDA) Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) was established to safeguard the health of low-income pregnant women and infants who are at nutritional risk. The WIC Infant and Toddler Feeding Practices Study–2 (WIC ITFPS-2)/ “Feeding My Baby” captures data on WIC caregivers and their children over the first 5 years of each child’s life to address a series of research questions regarding feeding practices, the effect of WIC services on those practices, and the health and nutrition outcomes of children on WIC. Additionally, the study assesses changes in behaviors and trends that may have occurred over the past 20 years by comparing findings to the WIC Infant Feeding Practices Study–1 (WIC IFPS-1), the last major study of the diets of infants on WIC. This study will provide a series of reports. The Infant Year (Year 1) dataset focuses on breastfeeding intention, initiation and duration, and the introduction of complementary foods. Subsequent datasets (Second Year, Third Year, and Fourth Year) focus on children’s dietary intakes, weight status, WIC participation status, and household characteristics.

Use limitations

Most data were obtained via telephone interviews with children’s caregivers, thus data are subject to recall bias. Please refer to the Second Year Report (https://www.fns.usda.gov/wic/wic-infant-and-toddler-feeding-practices-study-2-second-year-report) for a detailed explanation of the study’s limitations.

Temporal Extent Start Date

2013-01-01

Temporal Extent End Date

2018-12-31

Frequency

  • notPlanned

Theme

  • Not specified

Geographic Coverage

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Geographic location - description

United States

ISO Topic Category

  • health
  • society

National Agricultural Library Thesaurus terms

longitudinal studies; caregivers; children; WIC Program; women; infants; infant feeding; cohort studies; data collection; prenatal development; experimental design; processing technology; telephones; health care workers; cleaning; time series analysis; models; statistical analysis; interviews; food intake; USDA; automation; nutrition education; body weight; United States; Food and Human Nutrition

OMB Bureau Code

  • 005:84 - Food and Nutrition Service

OMB Program Code

  • 005:040 - National Research

Pending citation

  • No

Public Access Level

  • Public

Preferred dataset citation

USDA Food and Nutrition Service, Office of Policy Support (2022). WIC Infant and Toddler Feeding Practices Study-2 (WIC ITFPS-2): Prenatal, Infant Year, Second Year, Third Year, and Fourth Year Datasets. USDA FNS Office of Policy Support. https://doi.org/10.15482/USDA.ADC/1524654