The research aimed to find out the difference in calcium concentration in breast milk between the good nutritional status and Chronic Energy deficiency in postpartum mothers. The research was the Cross Sectional design research type. The samples are 40 people who were chosen using the purposive sampling technique, and who met inclusive criteria. The samples were collected. Fourteen days after giving the researcher, they came to the respondent's house to measure BB, LILA and 24 hours foodrecall and milked 3 cc, done by the researcher, and will check their breast milk through laboratory test using Colorimetric Assay. The data with not normal distributed were tested using the statistical shapiro-wilk test with the resultof α> 0,05. The analytical test used Mann Whitney and Chi-Square test.The research indicated that there was a very significant difference of calcium concentration between postpartum the mothers with good nutrition status and the mother chronic energy deficiency with p value = 0.025 (p <0.05). The research also revealed thet postpartum mothers who experienced the decrease of low concentration (median 166.7 mg/L) 7.0 times more risk to experience the deficiency of cronic energy compared to the mother with postpartum good nutrition status.