Weaning is a systematic process of introduction of suitable food at the right time, in addition to mothers’ milk, in order to provide needed nutrients to the baby. If the baby is to maintain the expected rate of growth and remain healthy and well nourished, supplementary feeding has to be resorted to round about the 6th month of life. The present study aimed to assess the knowledge of mothers of under-five regarding weaning diet, the effectiveness of planned teaching programme regarding weaning and to find out the association between knowledge with selected demographic variables. The findings of the study revealed that the planned teaching programme was effective in increasing the knowledge level of mothers of under five. There was the significant association between education and monthly income of the family. There was no significant association among age, religion, occupation, living status, type of family, the frequency of meals, and source of information