Two hundred and eighteen mothers and their breast-fed babics were investigated in six production brigades in Xin-hui District in south China.About 99% of the mothers in this rural areas chose breast feeding for their infants. The average milk secretion of the mothers were about 845 grams daily both by random measurements of 62mothers and 24-hours continuous mcasurements of 12mothers.About 16.6%lacked sufficient brcast milk to different degree in 114 mothers who fed their babies 1 to 6 months old and seemed that the lacking of milk was correlated with the lower caloric and protein intake of the mothers .The growth curme of the babies of this obscrvation reached a plateau in the third month after delivery but somewhat flattened after the fourth as compared with the American babies even the birth weights of babies in both countries were niarly the same.One of important measures is assumed of the supplementation of foods excluded the breast milk to sustain the growing needs of the babies after the third month.