Infant Data in the CDC Growth Chart Reference
The new infant growth charts were developed using data from several sources. NHANES III provided weight, length, and head circumference data beginning at 2 months of age. NHANES II provided data beginning at 6 months of age and NHANES I provided data beginning at 12 months of age. Because national surveys did not collect data between birth and 2 months of age, supplemental data was used. These data included 1) birth data from U. S. vital statistics; 2) length and weight-for-length data from Missouri and Wisconsin birth certificates; 3) length data from infants between 0.5 and 4.5 months of age in the Pediatric Nutrition Surveillance System; and 4) head circumference measurements at birth from the Fels Longitudinal Study.