The purpose of this research was to study the effects of antenatal breast care on decreases in breast discomfort and increases in the breast feeding rate during the postpartum period. A nonequivalent control group posttest research design was used. The experimental group consisted of fifty -one pregnant women(primigravida) who were receiving antenatal care in the OBGYN clinics of four hospitals between March 5 and May 30, 1991. The control group was made up of seventy - five postpartum women who delivered at two hospitals OBGYN clinic and one midwife clinic between May 4 and June 15, and between September 5 and October 15, 1991. Data were collected via telephone interviews on the seventh postpartum day and at the end of the second month. Data analysis methods used frequencies and the x$^2$- test. The results were as follows : 1. The rate of breast feeding practice at two months was higher in the experimental group(70.6%) than in the control group(25.3%) (p＜.01). 2. Nipple soreness in the early breast feeding period was lower in the experimental group(14.6%) than in the control group(25.3)(p＜.01). 3. Severe breast discomfort in the early breast feeding period was lower in the experimental group (12.5%) than in the control group(39.2%)(P＜.01). 4. There was a significant relationship between the breast feeding practice and the planned feeding method(p＜.05), and between breast feeding practice and nipple soreness(p＜.01) in the experimental group, and the presence of a job(p＜.01), the sex of the infant(p＜.05), and the first feeding time(p＜.05) in the control group. 5. The reasons for unsuccessful breast feeding were a deficiency of breast milk (66.7% in the experimental group, 30.4% in the control group), poor sucking on the part of the baby(13.3% in the experimental group, 21.4% in the control group).