Hi!
I personally think that it's best to include some healthy carbs while pregnant and breastfeeding, based on most of the info I've seen. For instance, AnnLouise Gittleman, the author of the program I'm following (the Fat Flush Plan, a moderate carb plan) recommends following the maintenance rules while pregnant/breastfeeding to make sure that there's a variety of nutrients being taken in and to fuel the additional needs of the mother's body while pregnant/nursing and the child, too. Afterall, mother's milk does contain quiet some carbs.
How about concentrating on eating whole foods, and limiting your carbs, but not excessively? What I mean is, if you concentrate on eating foods that haven't been processed and don't come from a package, fresh foods you make at home from fresh meats and veggies... and then add a portion of higher-GI carbs at every meal (like sweet potatoes, peas, maybe some beans) and otherwise make sure you eat a diet rich in "clean" (read: unrefined and unprocessed) foods, you'll do better and likely lose weight while still being able to nurse your little one.
Your priority should be to have a good milk supply, both quantity- and quality-wise. If you want to lose weight, it's best to make it a priority
after you are done nursing your little one (which is up to you, but I seem to understand you are an AP parent so it may be a while).
That's my view, it may not be shared by some LCers. As an LCer and a mom, I can tell you that I'm planning on trying for another one, and during my next pregnancy and while breastfeeding I don't plan on restricting my carbs that much. Sure, enough not to mess up my blood sugar (and by now I know how to spot that when it happens) but not with weightloss in mind.
Good luck and (thouch I know I'm about 7 months late) congrats on the new baby!