Dismatured babies are full-term babies (38 weeks' gestation), but birth weight is smaller than the period of pregnancy, which does not reach 2,500 grams. Year (2004), 7.1% of live births in the United States weighing less than 2,500 grams . 30% in the United States babies experience IUGR (Intra-Uterine Growth Retardation), which is stunted fetal growth in the uterus, and is born after 37 weeks. The purpose of this study was to determine the knowledge and attitudes of midwives about the handling of infant dysfunction at Medan Hajj Hospital in 2011. This research is descriptive in nature, using primary data obtained from respondents using a questionnaire. The population in this study were all midwives who worked at Medan Hajj Hospital, amounting to 22 people. The sampling technique is saturated sampling, where the entire population studied is sampled. Data processing is done through the process of editing, coding, tabulating, scoring, and analysis. From these results it can be concluded that the knowledge and attitudes of midwives about the handling of infant dysplasia obtained respondents demographic data that is dominant in the age of 25-29 years as many as 15 people (68%), dominantly educated D III as many as 21 people (95%), and dominantly has long time working 4-7 years as many as 13 people (59%). Knowledge of midwives about handling infants with dominant dysmatur is sufficient as many as 15 people (68%), and the attitude of midwives about handling infants with dominant dysmatur is as good as 13 people (59%). It can be concluded that the knowledge of midwives about Handling Infants with Dominant Dismatures is sufficient and the attitude of midwives about Handling Infants with Dominant Dismatures is sufficient. It is expected that the research sites and respondents will increase their knowledge and increase knowledge about handling infant complaints through formal and informal education.