Plasma aldosterone concentration was measured in 135 infants and children ranging in age from 2 weeks to 16 yr, using a sensitive radioimmunoassay method. The mean concentration of aldosterone during the first year of life was found to be significantly higher than at any other age (p < 0.005). This increase was found to be mainly due to an increased rate of secretion in relation to size.
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Kowarski et al. (1974) studied this question.