northener -
i have three friends who have 2 children and they all look great and lost their weight faster the second time.
i think it depends on your body starting out, if your fall pregnant with your first and you are alreay overweight and unfit then you can only expect to come out worse at the other end. but you then can correct it all by healthy eating and exercise and the second time will be a faster and better recovery.
i was slim and fit when falling pregnant with dd1, i breastfed for 8 months so did not diet and and never did, just ate healthy, eventually when she was 14mths I was back to pre pregnancy shape.
this time I am not as fit as I was before so I guess I will just make sure I got to all my antenatal yoga classes to tone my body so it can cope with the stretching, you wont get a saggy bum if you work it, do bum clenches
all my friends look great and you would not know they have two children. of course they may not love their bodies naked but you have to pay some kind of price for children.
dont let it worry you too much. if you were overweight before you fell pregnant then try not worry now, enjoy your pregnancy and baby when born, give yourself a while to adjust and get some energy back then get your ass in shape by exercising and eating healthy and you will look great in no time.
people who moan saying their kids made them fat, that is because they drive them to and from school, eat their snacks, remains of their dinner and do no exercise - once you get in the swing of healthy eating and exercise it becomes easy.
good luck
x