With all my 3 DCs my 9 months pregnant weight was 10 and a half stone so that seems to be my natural stopping point.
When I came home from hospital with my first I was outraged to discover that, having given birth to a 9lb 9oz baby, placenta, waters breaking, then having nothing to eat during a 24 hours labour then useless hospital rations for 3 days post-section afterwards, AND feeding a large massively hungry baby I HADN'T EVEN LOST A BLOODY STONE! I'd only lost about 12 sodding lb. 
However feeding like crazy once I got back soon did the trick, I started losing a pound a day and before too long I was 8st 2 !! which I had not been for a long time. I was relieved when the weight loss levelled out, I thought I was going to waste away.
I was confident the same thing would happen with DC2, but it didn't. She was much smaller, and although EBF I think my body could cope with feeding her OK without making me lose tons of weight. I remember dieting like mad to try to get under 9st before my 40th birthday and not losing a pound, 6 months later I finally stopped BF her (at 2.5) and tried dieting again, lost nearly a stone just like that - I think I lost 6lb in one week!
DS2 was similar, also smaller and not starving hungry all the time. I struggled for nearly a year to lose the last few pounds, and when I stopped the last feed-before-bed when he was 3, I was successful in a week or so.
I am now about 8st 12lb, maintained through a reasonable amount of self-control and a small amount of exercise, which I am very happy with.