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The present research is a descriptive and analytical study, which is done in order to investigate the reasons of failure in exclusive breast-feeding in Gorgan. 322 women with children between six to 12 months who referred to health center in Gorgan were chosen as convenience sampling. The instruments for collecting information were some questionnaires included open-ended or closed questions, which was related to individual, social and familial characteristics of parents and children. The findings showed that only 44.4% had exclusive breast-feeding. The most current additional liquid in 59.9% was Glucose water. The most important reason for beginning the additional nutrition was colic which most of the time was advised by grandmother (32.6%). Chi-square has shown maternal age, mother’s conception of her ability in breast feeding, feeling that she would not have enough milk to adequately nourish her baby child, acute diseases, the low birth weight and among the reason for failure to have exclusive breast feeding (P<0.05).