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Body measurements and determinations were made of normal children age 8 3/4 yr. Anthropometric indices most highly correlated with percentage fat as determined by body density were the sum of four skinfolds, relative weight, and triceps skinfold thickness. Girls had a significantly higher percentage of fat than boys. Percentage fat at this age was compared to longitudinal activity scores (based on 1-day activity records) obtained from 6 months to the current age. There was no significant correlation of activity with fatness in girls. In boys, activity at 3 and 4 yr had a significant negative correlation with fatness at age 8; activity at age 8 was not correlated. Relative-leanness-fatness was better related to past than current activity. Comparison of longitudinal activity scores revealed a continuity of activity patterns for short intervals (e.g., 1 yr), but over longer periods (e.g., 4 or more yr) the effect diminished.

The development of body fatness and leanness is examined in an ongoing prospective nutrition and growth study. Individual skinfold thicknesses, relative weights, weight gains, activity levels, and caloric intakes were examined at seven ages between 6 months and 9 years. Changes in body fatness in this group of children provide evidence that the obese infant usually does not

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