The Distribution of Sodium, Chloride and Fluid in the Body of Young Infants with Increased Intake of NaCl

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Abstract
The distribution of fluid, Na and Cl in the body of young infants (4 newborns 14 days old, 2 infants 42 days old) given milk with added NaCl was studied by means of the balance method. The urine flow after the salt addition was decreased, the excretion of Na and Cl in urine, stool and sweat increased. The gain of body weight simultaneously with the expansion of extracellular volume (by repeated estimation of thiosulfate distribution) was observed. The retention of Na and Cl in the body (estimated by their balance) being higher than their retention in extracellular fluid (ECF) shows that the remainder must be retained outside the ECF.