Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.
From the 2006 National Immunization Survey:
Exclusively through 3 months
Was the child ever breastfed or fed breast milk?
How old was [child's name] when [child's name] completely stopped breastfeeding or being fed breast milk?
How old was [child's name] when (he/she) was first fed formula?
This next question is about the first thing that [child] was given other than breast milk or formula. Please include juice, cow's milk, sugar water, baby food, or anything else that [child] may have been given, even water.
How old was [child's name] when (he/she) was first fed anything other than breast milk or formula?
*Note: Answers to questions about age when first fed formula AND age when first fed something other than breast milk or formula must both indicate that child was ≥3 months when either occurred OR that the child has never had formula nor anything else but breast milk.
Using a computer-generated list, the NIS identifies households across the United States with children aged 19–35 months and interviews the person who is most knowledgeable about the child’s immunization status (“caregiver”). Survey years are combined to calculate breastfeeding statistics by year of child’s birth (cohort) instead of the year in which the participant was surveyed. To calculate breastfeeding indicators by year of child birth, data are combined across all relevant survey years. Because children are 19—35 months of age at the time of the parent interview, each survey year represents children born over three years. For example, breastfeeding data for children in the 2006 birth cohort are obtained from NIS 2007, 2008, and 2009.
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