Rates of Any and Exclusive Breastfeeding by Age among Children Born in 2004
(Percent +/- half 95% Confidence Interval)
U.S. National Breastfeeding Rates, 2004
Child Age Breastfeeding
(n=30975)		 Exclusive Breastfeeding1 (n=27391)
At birth 73.1±0.8  
7 days 71.9±0.8 50.6±1.0
14 days 70.6±0.9 48.2±1.0
21 days 68.5±0.9 45.3±1.0
28 days 67.4±0.9 44.0±1.0
42 days 63.2±0.9 38.9±1.0
1 month 66.9±0.9 43.5±1.0
2 month 61.0±0.9 37.3±1.0
3 month 56.0±0.9 31.5±0.9
4 month 49.4±0.9 24.1±0.8
5 month 44.8±0.9 16.1±0.7
6 month 42.1±0.9 12.1±0.7
9 month 29.0±0.9  
12 month 21.4±0.8  
18 month 7.0±0.5  

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.