Aflatoxin M 1 is a biomarker for the detection of breast milk contamination and also a risk factor for early infant's exposure to the toxin. Exposure assessment of 50 internally displaced infants to aflatoxin M 1 through breast-milk feeding was carried out between (June 2016 to October 2016), High performance liquid chromatography (HPLC) was used to evaluate the level of AFM 1 in mother's breast milk samples and the infant's urine samples respectively. Results obtained from the study showed that 96% of the breast milk samples have maximum concentration of 0.0879µg/L with mean value of 0.0582µg/L while, the minimum and maximum excretion concentration of AFM 1 in urine sample of infants was 0.0400µg/L and 0.0651µg/L respectively with mean value of 0.05005µg/L at 88%. The study indicates that the occurrence of AFM 1 in breast milk samples of mothers with the types of food they consumed within 24-48hrs prior to sample collection that predispose the infant's exposure Original Research Article