Infancy starts from the age of 0-12 months which is characterized by rapid growth and physical changes accompanied by changes in nutritional needs. The weight growth of infants aged 0-6 months has increased by 150 -210 grams / week. Lack of knowledge of the mother affects the rate of growth of the baby's weight which can result in the baby being malnourished during its growth period. Descriptive survey research method uses a descriptive correlational design. The population in this study were all mothers who had babies aged 3-6 months, the sampling technique was accidental sampling with a total of 50 respondents. The instrument used in the form of a questionnaire. Data analysis using the Chi-Square Test. Based on the results of the study, the majority of 50 respondents had sufficient knowledge as much as 31 (62%). The Chi Square test result is 0.013, it can be seen that the calculation of the significant coefficient test is obtained at the real initial a = 0.05 and the Chi Square test p = 0.013 so that 0.013 <0.05.
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