Expressing breast milk refers to the process by which a women expels milk from her breast. The breast milk can then be stored and feed to her baby at a later point in time. Milk may be expelled manually using hands or with a pump especially designed for expressing breast milk. Breast feeding is fundamental to health developments of children and also important to the health of the mother. Just there is no substitute of mothers love’s there is substitute of mother’s milk. Breast milk is not only the best, but a must for the infants. Therefore this study was conducted with the aim to assess the knowledge regarding expressed breast milk among postnatal working mothers admitted in peoples hospital Bhanpur Bhopal (M.P.)