Althought I am not on South Beach, I have read the book. I ama vegitarian and so I can not really do those diets but I eat very low carb and I am concious of what I eat. I have lost 20 pounds in the last 2 months this way. That said, my milk supply has dropped for sure, but since my ds in going on two I am not real concerned about it. Your ds is still really littl and if you are already supplementing with formula, I would worry that the SBD would likely compromise your nursing relationship. Personally, I think diets in the first year are no good. Instead, you might consider just limiting your sugar and white flour and increasing your activity level. This is a more gentle, nursing-safe approach.
Megan Davidson, Labor & Postpartum Doula, Breastfeeding Counselor, Anthropologist, Mom to August (9) and Clay (4), Partner to Shawn.