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The Centers for Disease Control and Prevention 2000 growth charts and the growth of breastfed infants
1Department of Nutrition for Health and Development, World Health Organization, Geneva, Switzerland. deonism@who.int
Insights
Growth charts from the Centers for Disease Control and Prevention (CDC) show differences in assessing healthy breastfed infants compared to international standards. A specialized reference for breastfed infants is needed for accurate growth assessment.
Area of Science:
- Pediatrics
- Growth and Development
- Nutritional Science
Background:
- Current growth charts, such as those from the Centers for Disease Control and Prevention (CDC), are widely used for assessing infant growth.
- However, these charts may not accurately reflect the growth patterns of exclusively breastfed infants, who have distinct growth trajectories.
- The National Center for Health Statistics/World Health Organization (NCHS/WHO) reference is another widely used standard.
Purpose of the Study:
- To evaluate the performance of the 2000 CDC growth charts in assessing the growth of healthy breastfed infants.
- To compare the CDC growth charts with the NCHS/WHO reference for this specific population.
Main Methods:
- A longitudinal sample of 226 healthy breastfed infants was analyzed.
- Weight-for-age (WA), length-for-age (LA), and weight-for-length (WL) z-scores were calculated using both CDC and NCHS/WHO references.
- Age-specific mean z-scores and proportions above/below cut-off points were determined.
Main Results:
- Breastfed infants exhibited faster early growth (first 2 months) and slower later growth (3-12 months) compared to CDC WA curves.
- Linear growth (LA) exceeded the CDC median until 4 months, then declined.
- The CDC reference indicated infants were heavier and shorter, leading to a higher estimated prevalence of wasting compared to the NCHS/WHO reference.
Conclusions:
- Significant differences exist in the growth trajectories of breastfed infants when assessed using the CDC reference compared to the NCHS/WHO reference.
- A dedicated growth reference based on healthy breastfed infants is necessary for accurate assessment of infants following international feeding recommendations.
Aim:
To evaluate the performance of the 2000 Centers for Disease Control and Prevention (CDC) growth charts in comparison with the National Center for Health Statistics/World Health Organization (NCHS/WHO) reference as a tool for assessing growth in healthy breastfed infants.
Methods:
Weight and length measurements were obtained from a pooled longitudinal sample of 226 healthy breastfed infants. Weight-for-age (WA), length-for-age (LA) and weight-for-length (WL) z-scores based on the CDC and NCHS/WHO references were computed for each child. Age-specific mean z-scores and proportions below and above specific cut-off points were calculated.
Results:
Breastfed infants grow more rapidly in the first 2 mo of life and less rapidly from 3 to 12 mo in relation to the CDC WA curves. Similarly, breastfed infants experience greater linear growth than the CDC median until age 4 mo. Thereafter, the mean LA z-score declines until month 9. Apart from a 1-mo difference in the time when linear growth begins to falter, the pattern of growth is remarkably similar when compared with the two references. The growth trajectories indicate that infants in the CDC reference are heavier and shorter than the NCHS/WHO reference population. Combining the two measurements as WL reveals that higher weight overrides lower length in the CDC versus the NCHS population, thus the estimated prevalence of wasting is higher by the CDC reference.
Conclusion:
As was the case when compared with the NCHS/WHO reference, there are notable differences in the growth trajectory of breastfed infants examined against the CDC reference. A reference based on healthy breastfed infants is required if the growth patterns of infants following international feeding recommendations are to be correctly assessed.
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