Background: The knowledge on minor disorders of newborn is very much essential for the mothers. Our study is to assess knowledge on minor disorders of newborn among the postnatal mothers in Selected hospital at chengalpet district. The objectives were to assess the pretest knowledge of postnatal mothers regarding selected minor disorders of newborn and the effectiveness of planned teaching programme on selected minor disorders of newborn among postnatal mothers and determine the association between pretest and post test knowledge scores on selected minor disorders of newborn with their selected demographic variables.

Materials and Methods: Purposive sampling technique is used to select 50 samples of primi postnatal mothers. The data were collected by self administered questionnaire. The collected data was tabulated and analyzed.

Results: Descriptive and inferential statistics methods were used. The study shows that 68% of postnatal mothers had inadequate knowledge, 30% of postnatal mothers had moderate knowledge, 2% of postnatal mothers had adequate knowledge in pretest. And in post-test, 0% of postnatal mothers had inadequate knowledge, 30% of postnatal mothers had moderate knowledge and 70% of postnatal mothers had adequate knowledge.

Discussion: There was no significant association between the knowledge and demographic variables like an age, education, occupation, residence, mode of delivery, age of child, birthweight of baby, complication.