Why does my breast milk smell?
Breast milk has more than 60 components with odours, and every mother’s milk has a unique composition. That gives breast milk a range of odours that have been described in many ways, including hay-like, metallic, sweet, and fatty. Fresh breast milk has a mild smell, but that can change when it is stored. Newborns are attracted to the smell of their mother’s colostrum, the first form of milk, and at four days old they can tell the difference between their mother’s milk and another mother’s. The smell of their mother’s milk can stimulate a baby's appetite, calm them, and reduce pain when they undergo procedures.