Background: In developing countries, pregnancy and child birth are one of the leading causes of death for women of reproductive age. The slogan for world health day 2005 “making every mother and child count” reflects the reality that today, government and the community need to make the health of women and children a higher priority. Every minute, at least one women dies from complications related to pregnancy and child birth that means 1,400 women die every day , more than half a million women die every year. Five direct complications account for more than 70% maternal deaths. Hemorrhage (25%), infection (15%), unsafe abortion (13%), eclampsia (12%) and obstructed labor (8%). The present study to assess the pre and post test knowledge, practice and attitude of primi antenatal mothers regarding warning signs during pregnancy, to compare the pre test and post test knowledge, practice and attitude scores among primi antenatal mothers regarding warning signs during pregnancy, to correlate the post test knowledge score with attitude score regarding warning signs during pregnancy and to find out the association between knowledge and attitude scores with selected demographic variables. The research design used for the study was one group pretest posttest, pre experimental design. Purposive sampling technique was used to select 60 samples for the study. The tool used for the study was structured interview schedule and five point likert scale. The data gathered were analyzed by using descriptive and inferential statistics. Findings showed that the structured teaching programme was effective in increasing the knowledge, knowledge on practice and attitude among primi antenatal mothers regarding warning signs during pregnancy. Thus structured teaching programme played an important role in improving the knowledge, knowledge on practice and attitude of primi antenatal mothers. The study findings revealed that there was a significant improvement in knowledge, knowledge on practice and attitude of primi antenatal mothers by STP. Based on the statistical findings („t‟ value = 38.2, 60.52, and 19.9). It is evident that the structured teaching programme will motivate the primi antenatal mothers and help them to acquire knowledge about warning signs during pregnancy which will promote adequate practice in them to ensure maternal and fetal well being