Abstract
To the Editor: Three infants, five to six months of age, had been given Neo-Mull-Soy formula (Syntex Laboratories, Palo Alto, California) for three to six months before hospitalization in June, 1979, for evaluation of failure to thrive. The heights of the infants were between the 25th and 75th percentiles, the weights were below the fifth percentile, and the blood pressures were normal for age. As shown in Table 1, laboratory data revealed a hyponatremic, hypokalemic metabolic alkalosis, with increased plasma renin activity (normal values [mean ± S.D.], 6.3±1.2 ng per milliliter per hour) and plasma aldosterone levels (normal range, 3 to . . .

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