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Children 1-4 years old account for over half of WIC participants, April 2014

Infants 23.0%.
Pregnant women 9.6%.
Postpartum women 6.6%.
Breastfeeding women 7.4%.
1-year olds 19.6%.
2-year olds 13.8%.
3-year olds 12.3%.
4-year olds 7.6%.

Source: Prepared by ERS, USDA, using April 2014 data from "WIC Participant and Program Characteristics: 2014 Final Report," USDA, Food and Nutrition Service (see Table II.3).

Available at: http://www.fns.usda.gov/sites/default/files/op/WIC2014.pdf