Hi Terri, I would want some more information. For example, is this her first lactation? Did she experience a noticeable difference in supply with prior lactations? I have heard of baby refusing breast when there was breast cancer - a rare situation indeed. However if none of the other probable factors makes sense, I would ask mom to get checked out, exam, ultrasound, and/or mammography. But more than likely, I would be looking for some of the following: mild or marked breast assymetry prior to lactating? Perhaps baby began favoring the fuller side and gradually discontinued using the other side. As the less used side involutes, it can get a salty taste. Any difference in size, shape between the 2 nipples? Again, a baby could easily favor the side with the more everted nipple. Potentially did the baby have any positional issues, a difficult birth or in utero position or presentation to lead baby to use one position or side, e.g. football hold on one particular side? Any history of mastitis in the lower producing side, either with this lactation or a prior one? Even with a mother lactating for a 6 month old, I would not expect that much of a difference between sides, size A (involuting side) vs D cup, so I am wondering about pre-existing less glandular tissue on the A side. I do not think that having prolactin levels or using reglan would make a difference. I have seen women with no breast pathology whose older baby decided to prefer one side, and mother let the other dry up, and continued unilaterally. Or mother can express the A side, using that milk in cup or in baby's food. Perhaps baby will take that side after filling up on the full side, and nurse for comfort there. Hope my thoughts are helpful to you, Laurie Laurie Wheeler, MN RN IBCLC Mississippi USA *********************************************** Archives: http://community.lsoft.com/archives/LACTNET.html To reach list owners: [log in to unmask] Mail all list management commands to: [log in to unmask] COMMANDS: 1. To temporarily stop your subscription write in the body of an email: set lactnet nomail 2. To start it again: set lactnet mail 3. To unsubscribe: unsubscribe lactnet 4. To get a comprehensive list of rules and directions: get lactnet welcome