Provisional Rates of Any and Exclusive Breastfeeding by Age among Children Born in 2007 (Percent +/- half 95% Confidence Interval)
U.S. National Breastfeeding Rates, 2007
Child Age Breastfeeding
(n=16629)		 Exclusive Breastfeeding1 (n=16336)
At birth 75.0±1.2
7 days 73.7±1.2 50.9±1.4
14 days 72.6±1.2 49.1±1.4
21 days 70.4±1.2 46.8±1.3
28 days 69.4±1.2 45.5±1.3
42 days 64.8±1.3 40.4±1.3
1 month 68.8±1.2 44.8±1.3
2 month 62.9±1.3 39.1±1.3
3 month 57.5±1.3 33.0±1.2
4 month 51.1±1.3 26.5±1.2
5 month 46.2±1.3 17.5±1.0
6 month 43.0±1.3 13.3±0.9
9 month 30.0±1.2
12 month 22.4±1.1  
18 month 7.4±0.8

1Exclusive breastfeeding is defined as ONLY breast milk — NO solids, no water, and no other liquids.

Source: National Immunization Survey, Centers for Disease Control and Prevention, Department of Health and Human Services

Sample sizes appearing in the NIS breastfeeding tables are slightly smaller than the numbers published in other NIS publications due to the fact that in the DNPAO breastfeeding analyses, the sample was limited to records with valid responses to the breastfeeding questions.