Nandre, please check with your OB/GYN or regular doc before starting SBD to ensure that you are providing the right nutrition to your little one, okay? In another post, we decided as a group that a nursing mother should definitely avoid Phase 1 until they have spoken with their doctor. I haven't seen anything listed in the books about SBD and nursing, so it would be up to a doctor to advise you as to what phase you should be on.
That said, I think it would be tough to control cravings without the detox of Phase 1...so you might need to wait until you are no longer nursing to really get all the benefits.
Congratulations on your new arrival, by the way. :BB:
Nursing can burn 500 calories in a sitting, which is already going to help you lose weight.
In addition, try eating your carbs later in the day. Many people on here (myself included) find that eating them in the morning causes cravings throughout the day. Also, eat your starch with protein. That helps a lot in controlling cravings. Good luck!