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From the thirtieth day of pregnancy until delivery, rhesus monkeys were fed a semisynthetic diet containing 3.35, 6.70, or 13.40 per cent protein. Various aspects of the growth of 31 of the infants horn to these mothers were studied to determine whether or not growth alterations might occur in the low-protein infants. No significant differences could be detected in weight, radius length, a weight/radius index, skeletal maturity, food intake, and food efficiency. These results, along with the others previously obtained, indicate that the mother fed low protein during pregnancy is able to adjust her metabolic processes to accommodate the infant's requirements.