68 THE EVOLUTION OF MAN 



after birth, the postnatal retardation. During the first year, 



growth in both weight and height is rapid the boy increasing 



AGE 

 o 5 



10 



YEARS 



eo 25 



70 



60 



50 



30 



Females 



140 



120 



100 



80 



60 



Fig. 25. Growth curves for increase in weight and stature 

 for both sexes. From Donaldson, after Roberts. 



