This was a pre-experimental study to confirm the breastfeeding ability and effect of follow-up care on the breastfeeding rate and the breastfeeding method by the mother-infant breastfeeding assessment tool for the mothers who got the breastfeeding education.The subjects were 46 mothers who experienced normal delivery of infants at a college hospital in K-city, Kyungsangbuk-do, from July 1 to October 21, 2000.The instrument for data obt ain ment were The Mot h er - Infa n t Br ea st - F eedin g Assessm ent Tool of J oh n son et al. (1999), and The Breast-Feeding Method Measurement Tool of Jeong, Geum-hee (1997). This instrument was reliable, showing Cronbach α .751.This study classified them into 3 groups: at high risk for breastfeeding failure, at risk for breastfeeding problems, and at low risk for breastfeeding failure by the mother-infant breastfeeding assessment tool on the day of discharge from the hospital after delivering individual breastfeeding education to the subjects.This study investigated the breastfeeding rate and the breastfeeding method through a mail questionnaire at the four-week after childbirth, and through the phone counseling and the home visit for follow-up care at the first week and the second week after childbirth. Reason 2: Corrected spacing and punctuation errors. The sixth week after childbirth, this study investigated the breastfeeding rate by phone.The data analyzed the hypotheses by χ2-test, paired t-test, ANOVA, Wilcoxon signed rank test, Wilcoxon rank sum test, and trend analysis using SPSS/PC+WIN 10.0 program.The results were as follows:1) Hypothesis 1-1, there won't be any difference the breastfeeding rate of a group at risk for breastfeeding failure by the time elapsed was supported through constant the breastfeeding rate, because changes in the breastfeeding rate by the time elapsed after childbirth wasn't statistically significant (t = -1.501, p = .270).Hypothesis 1-2, there won't be any difference in the breastfeeding rate of group at low risk for breastfeeding failure by the time elapsed was supported through constant the breastfeeding rate, because changes in the breastfeeding rate by the time elapsed after childbirth wasn't statistically significant (t = -1.732, p = .225).2) Hypothesis 2-1, there won't be any difference between the breastfeeding method of group at risk for breastfeeding failure for four weeks after childbirth and just after childbirth was rejected, because the mean point of post-test appeared to be higher than that of pre-test (t = -7.267, p = .000).Hypothesis 2-2, there won't be any difference between the breastfeeding method of the group at low risk for breastfeeding failure for four weeks after childbirth and just after childbirth was rejected, because the mean point of posttest appeared to be higher than that of pretest (t = -2.501, p = .012).3) The third hypothesis, there won't be any difference between breastfeeding method of groups at risk for breastfeeding problems and at low risk for breastfeeding failure at the 4th week after childbirth and just after childbirth didn't show any difference between the breastfeeding method of groups at risk for breastfeeding problems and at low risk for breastfeeding. g failure in the advance test (t = -1.521, p = .130) but there was difference between them in post test (t = -2.012, p = .044). As a result, the 3rd hypothesis was supported by pretest, but it was rejected by posttest.In conclusion, this study confirmed that breastfeeding education and follow-up care just after childbirth were effective for the breastfeeding rate and method.According to the proposed successful nursing intervention of breastfeeding, it is necessary to continuously provide follow-up care through the mother-infant breastfeeding assessment tool as well as to execute individual breastfeeding education to mothers just after childbirth.