This study investigated the effect of a health-related lifestyle on knowledge, attitude, control belief and behavior intentiontoward breast-feeding of male and female university students in order to develop a breast-feeding education program forstudents of childbearing age. The subjects were 445 university students (125 male and 325 female) residing in eightprovinces in Korea. The overall percentage of subjects intending to breast-feed their baby was 80.7% (73.6% of males and84.2% of females). Overall, 84.2% of the subjects had high concerns about their health status. Scores reflecting a positiveattitude, knowledge, and control beliefs toward breast-feeding were significantly higher (p<0.05~p<0.001) in femalestudents, students majoring in medicine, and higher grades. The students who scored high at attitude, knowledge, andcontrol beliefs also had a significantly higher (p<0.001) intention to breast-feed. When we investigated the sub factors ofattitudes toward breast-feeding, significantly more students taking nutrient supplements scored high for physiological factors(p<0.05) and health-related factors (p<0.01). Significantly more non-smoking and non-drinking students scored high forhealth-related factors (p<0.001) and physiological factors (p<0.001), respectively. The intention to breast-feed was foundto be significantly higher (p<0.01) in students who did not smoke, but not with other health-related lifestyles. In summary,these results indicate that the majority of university students intend to breast-feed, with students having a positive attitude,higher knowledge, and stronger control beliefs having a higher intention to breast-feed. Although a student's health-relatedlifestyle affects their attitudes on the physiological and health-related aspects of breast-feeding, only smoking status had anobservable connection on the intention to breast-feed. Thus, when developing breast-feeding education programs forstudents, we recommend efforts to enhance a favorable attitude, knowledge, and control beliefs toward breast-feeding.