Today I managed to do the full core I routine, all the way through. My groin muscles and very base of my abs are still very stiff, but I managed even the poses that stretched those. In fact, I'm even back to being able to reach the floor in my forward bends, after only 3 sessions!
Weight-wise, nothing has changed: I'm stuck at 154.
But at least my body is getting its flexibility back! The weight will be easier to take off when I can do more outdoor exercise, I expect. Dieting while nursing = not the best plan. :P