A descriptive research design was used to assess the level of knowledge and attitude of Mothers Regarding Growth of Under Five Children in a selected hospital, Kottayam. The study was conducted in little Lourdes college of nursing kidangoor. The study samples consist of 30 mothers of under five children who came to pediatric and gynecology outpatient departments and wards. Samples are selected by using convenient sampling technique. Structured knowledge questionnaire and 3 point attitude scale used to collect data. The result shows that among 30 samples 6 (20%) of mothers had poor knowledge and 24 (80%) of mothers had average level of knowledge. Among 30 samples 14 (46.6%) of mothers had moderately positive attitude, 16 (53.3%)of mothers had positive attitude towards the growth of under five children. The study findings revealed that there is a significant correlation between knowledge and attitude of mothers regarding the growth of under five children (r=0.63)