Fig. 1. A. National Center for Health Statistics physical growth chart for boys, birth to 36 months. B. Prepubescent physical growth 2 to 18 years. (Adapted from Hamill PVV, Drizd TA, Johnson CL, Reed RB et al: Physical growth: National Center for Health Statistics percentiles. Am J Clin Nutr 32:607–629, 1979. Data from the Fels Longitudinal Study, Wright State University School of Medicine, Yellow Springs. Ohio. Courtesy of Ross Laboratories)