Well, I grew a massive bump (people would stop on the streets to look at me, which is not something Londoners usually do!) and I put on 15kg (2.4 stone). I grew gigantic tights and very "strong" arms.
The good part of the story is that after 4 months I was back to my pre pregnancy weight, and then lost other 5 kg. My tummy looks very well (but my belly button is completely different now, which I don't like, but still think I was quite lucky in the end).
I believe that exclusive breastfeeding was a major factor on the weight loss (that and all the physical work of taking care of a baby, compared to the sedentary life I led before).
However, my immediately post partum body was a shock! I didn't expect my boobs to get that big! That, together with the huge arms and tummy, meant that I had no top at all that would fit me! I had to run to Sainsburys and buy all the size 18 tops they had! (I'm a size 8/10 normally).
And I wore a tight band on my tummy for the first few weeks (months, really). It's what every woman does where I come from, and it helped me enormously. I felt very uncomfortable with that big saggy tummy and hated if anything touched it. Felt much better with the band (I bought a belly bandit - www.bellybandit.co.uk/ , but there are cheaper ones available). Supposedly it helps the tummy go back to place as well.
Bottom line is that my body is better now than pre pregnancy (and I'm 32, so not exactly young), so I guess it's a positive story.
(now let's see how things go on the next pregnancy...)