I'm still nursing my 2 year old and I was wondering if my breasts will engorge and swell to the size of my head again when I have this baby if I've already got milk and am already nursing?
Your milk will turn to colostrum at some point in pregnancy. So there will be colostrum for the newborn, and then the milk will "start over" so its newborn milk. For me, it was just like the first time! But the great thing was my 2yo was there to rescue me from engorgement! So for a couple weeks, around 5-6am I would be super engorged and I'd look at that tiny baby with his marble sized tummy sleeping peacefully (Since I'd just nursed him back to sleep) and then give dh a shove "go get dd!" she'd come in and drain them both in just a couple minutes. It rocked. I did notice that my supply leveled out much quicker the second time around than the first time, and I wasn't so prone to getting randomly engorged for nearly as long. I had a few months of engorgement the first time.
Ohhh, I am curious how nursing two was for you while you were pregnant, and how nursing 3 went! I am still tandem nursing but I do try to limit my two quite a bit because it gets to be a bit much sometimes.