Q&A: Why Does My Milk Taste Bad?
Why would the milk from one of my breasts taste bad? (Just one of them.) Baby started refusing the one side so I tasted and it isn't good. Have you ever heard of this?
When a mother has mastitis — also known as plugged ducts or a breast infection — this makes her milk taste salty. But within a week of the mastitis resolving, the old flavor is back. Some babies refuse the affected breast during bouts of mastitis. In this case, express milk from that breast to keep up your milk production until the mastitis is gone.