Yay!!! Congratulations! (:
I nursed my son until he was 16 months . It was important to me b/c it can help reduce a child's risk of getting T1. But, it was also beneficial to me b/c my BG's ran sooo low. Once I really cut down my insulin, they were pretty smooth and even, w/o lots of spikes. I was sad about my "new" numbers when I weaned him, lol. My first month or so post-birth I had some REALLY scary lows though, and I was too tired and out of it to really be paying attention to my BG's. In hindsight, I should have tried to run much higher, but again, I was a bit distracted. (;
They say T1's may have their milk come in later (sorry guys reading this, just plug your ears, lol). I had that problem, but it was also my 1st child so it could have just been one of those things. But I worked with a lactation consultant who came to my home (more helpful than the ones in the hospital b/c it was more in depth). She had me nursing w/o problems in a week.
Each time my son cut back his daily feedings (e.g., start of solids, etc), I had to raise my insulin slightly and noticed changes in my BG's, but not as extreme as the post-birth changes.
I have also heard you don't have to be quite as worried about high BG's while BF'ing, as compared to pregnancy, although there's less research out there. There are some old studies showing a high a1c while BF'ing may lead to an overweight baby, but my doctors all seemed to discount that research now. I tried to stay at a reasonable number, but not as low as when pregnant.
Send me a message of you have any more questions. I'm sure you'll be able to do it! It was so much hard work, but worth it in the end. (: