Breastfeeding is defined as a child being fed breastmilk directly from the mother, or milk that was pumped from the mother’s breast, with or without the addition of complementary liquids or solids. Yearly data reflect the year of the child’s birth, not the survey year. Before 2009, the survey was conducted on landline phones only, but more recent data were collected from both landlines and cell phones.
 U.S. Department of Health and Human Services, Office of Disease Prevention and Health Promotion. (2018). 2020 topics & objectives: Maternal, infant, and child health. Retrieved from https://www.healthypeople.gov/2020/topics-objectives/topic/maternal-infant-and-child-health/objectives.
 Questions regarding breastfeeding are asked of all parents of a child 19 to 35 months old.
 Bitler, M., Gundersen, C., & Marquis, G. S. (2005). Are WIC nonrecipients at less nutritional risk than recipients? An application of the food security measure. Review of Agricultural Economics, 27(3), 433-438.
 Reat, A., Crixell, S., Von Bank, J., Thornton, H., & Friedman, B. J. (2014). Average infant formula and breastmilk intake among WIC infants reflects food package changes. The FASEB Journal, 28(Supplement 1), 632–639.
Child Trends Databank. (2018). Breastfeeding. Available at: https://www.childtrends.org/?indicators=breastfeeding